Patent Publication Number: US-2023134634-A1

Title: Anomaly detection system, anomaly detection apparatus, and anomaly detection method

Description:
TECHNICAL FIELD 
     The present disclosure relates to an anomaly detection system, an anomaly detection apparatus, and an anomaly detection method. 
     BACKGROUND ART 
     A magnetically levitated train travels by levitating and propelling its vehicle body from a track using repulsive and attractive forces of a magnetic force. A typical example of the magnetically levitated train is a linear bullet train that uses the attraction and repulsion action of a superconducting magnet installed in the magnetically levitated train on the vehicle side thereof and a coil installed in the magnetically levitated train on the guideway side thereof. 
     In recent years, progress in the practical application (commercialization) of a linear bullet train has been made, and safety measures such as maintenance of the vehicle and the guideway of a magnetically levitated train have been studied accordingly. 
     For example, Patent Literature 1 discloses a technique for safely operating the vehicle of a magnetically levitated train. Specifically, in Patent Literature 1, an optical fiber is laid along a side wall panel including a track on which the vehicle travels, and the strain of the track generated by an earthquake or the like is measured by using the optical fiber as a strain sensor. When it is determined that an anomaly has occurred based on a result of the measurement by the optical fiber, reduction of the speed of the vehicle, stopping of the vehicle, or the like are performed. 
     CITATION LIST 
     Patent Literature 
     
         
         Patent Literature 1: Japanese Unexamined Patent Application Publication No. 
       
    
     SUMMARY OF INVENTION 
     Technical Problem 
     According to the technique disclosed in Patent Literature 1, when a disaster such as an earthquake has occurred, the vehicle of a magnetically levitated train can be safely operated. However, Patent Literature 1 does not disclose that an anomaly which has occurred in the vehicle or the guideway of the magnetically levitated train can be detected. 
     Therefore, an object of the present disclosure is to provide an anomaly detection system, an anomaly detection apparatus, and an anomaly detection method that are capable of solving the above-described problem, and detecting an anomaly which has occurred in the vehicle or the guideway of a magnetically levitated train. 
     Solution to Problem 
     An anomaly detection system according to an example aspect includes: 
     an optical fiber configured to detect a state of a metal member affected by a magnetic force generated between a vehicle and a guideway of a magnetically levitated train; 
     a reception unit configured to receive, from the optical fiber, an optical signal including information indicating an effect of the magnetic force received by the metal member; and 
     a detection unit configured to detect an anomaly of the vehicle or the guideway based on the information indicating the effect of the magnetic force received by the metal member, the information being included in the optical signal. 
     An anomaly detection apparatus according to an example aspect includes: 
     an acquisition unit configured to acquire information indicating an effect of a magnetic force received by a metal member, the information being included in an optical signal received from an optical fiber configured to detect a state of the metal member affected by the magnetic force generated between a vehicle and a guideway of a magnetically levitated train; and 
     a detection unit configured to detect an anomaly of the vehicle or the guideway based on the information indicating the effect of the magnetic force received by the metal member. 
     An anomaly detection method according to an example aspect is an anomaly detection method performed by an anomaly detection system, the anomaly detection method including: 
     a reception step of receiving, from an optical fiber configured to detect a state of a metal member affected by a magnetic force generated between a vehicle and a guideway of a magnetically levitated train, an optical signal including information indicating an effect of the magnetic force received by the metal member; and 
     a detection step of detecting an anomaly of the vehicle or the guideway based on the information indicating the effect of the magnetic force received by the metal member, the information being included in the optical signal. 
     Advantageous Effects of Invention 
     In accordance with the above-described example aspects, it is possible to achieve an effect that an anomaly detection system, an anomaly detection apparatus, and an anomaly detection method that are capable of detecting an anomaly which has occurred in the vehicle or the guideway of a magnetically levitated train can be provided. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a diagram showing the principle of a magnetically levitated train; 
         FIG.  2    is a diagram showing the principle of the magnetically levitated train; 
         FIG.  3    is a diagram showing a configuration example of an anomaly detection system according to a first example embodiment; 
         FIG.  4    is a diagram showing an example of a state in which an optical fiber and a metal wire according to the first example embodiment are installed on a guideway side; 
         FIG.  5    is a diagram showing an example of the state in which the optical fiber and the metal wire according to the first example embodiment are installed on the guideway side; 
         FIG.  6    is a diagram showing an example of a state in which the optical fiber and the metal wire according to the first example embodiment are installed on a vehicle side; 
         FIG.  7    is a diagram showing an example of the state in which the optical fiber and the metal wire according to the first example embodiment are installed on the vehicle side; 
         FIG.  8    is a diagram showing a modified configuration example of the anomaly detection system according to the first example embodiment; 
         FIG.  9    is a flow diagram showing an example of a flow of operations performed by the anomaly detection system according to the first example embodiment; 
         FIG.  10    is a diagram showing an example of a method by which a detection unit according to a second example embodiment determines whether an anomaly has occurred in the vehicle or it has occurred in the guideway when the optical fiber and the metal wire are installed on the guideway side; 
         FIG.  11    is a diagram showing an example of a method by which the detection unit according to the second example embodiment determines whether an anomaly has occurred in the vehicle or it has occurred in the guideway when the optical fiber and the metal wire are installed on the vehicle side; 
         FIG.  12    is a flow diagram showing an example of a flow of operations performed by the anomaly detection system according to the second example embodiment; 
         FIG.  13    is a diagram showing a configuration example of an anomaly detection system according to a third example embodiment; 
         FIG.  14    is a flow diagram showing an example of a flow of operations performed by the anomaly detection system according to the third example embodiment; 
         FIG.  15    is a diagram showing a configuration example of an anomaly detection system according to another example embodiment; and 
         FIG.  16    is a block diagram showing an example of a hardware configuration of a computer that implements the anomaly detection apparatus according to the example embodiments. 
     
    
    
     EXAMPLE EMBODIMENT 
     Example embodiments of the present disclosure will be described hereinafter with reference to the drawings. Note that, for the clarification of the description, the following descriptions and the drawings are partially omitted and simplified as appropriate. Further, the same elements are denoted by the same reference symbols throughout the drawings, and redundant descriptions are omitted as necessary. 
     First Example Embodiment 
     Prior to describing a first example embodiment, the principle of a magnetically levitated train will be briefly described with reference to  FIGS.  1  and  2   .  FIG.  1    is a top view of a vehicle  60  of a magnetically levitated train (hereinafter referred to simply as a “vehicle  60 ” as appropriate) and a guideway  50  of the magnetically levitated train, while  FIG.  2    is a front view of the vehicle  60  and the guideway  50 . 
     As shown in  FIGS.  1  and  2   , the guideway  50  is a traveling path of the vehicle  60 , and the vehicle  60  travels in the guideway  50 . 
     As shown in  FIG.  1   , superconducting magnets  61  are installed in the inner side surfaces of the vehicle  60  on the left and right sides thereof (both sides thereof in the y direction) along the direction (the x direction) in which the guideway  50  is extended so that the north and south poles of the superconducting magnets  61  are alternately arranged. A magnetic field is generated by making an electric current pass through the superconducting magnets  61 . 
     Propulsion coils  52  are installed on side walls  51  of the guideway  50  on the left and right sides thereof (both sides thereof in the y direction) along the direction (the x direction) in which the guideway  50  is extended. In accordance with the movement of the vehicle  60 , a magnetic field is generated by making a current pass through the propulsion coils  52  and the magnetic poles of the propulsion coils  52  are switched. By doing so, a pushing force (a repulsive force) and a pulling force (an attractive force) are generated between the superconducting magnet  61  and the propulsion coil  52 . As a result, the vehicle  60  moves forward. 
     Further, as shown in  FIG.  2   , levitation/guide coils  53  are installed on the side walls  51  of the guideway  50  on the left and right sides thereof (both sides thereof in the y-direction) along the direction (the x direction) in which the guideway  50  is extended so that the levitation/guide coils  53  are closer to the vehicle  60  side (the positive side or the negative side in the y-direction) than the propulsion coil  52 . When the superconducting magnet  61  of the vehicle  60  approaches the levitation/guide coil  53 , an induction current flows in the levitation/guide coil  53  and this levitation/guide coil  53  becomes an electromagnet. By the above, a force (a repulsive force) for pushing up the vehicle  60  from below and a force (an attractive force) for pulling up the vehicle  60  are generated between the superconducting magnet  61  and the levitation/guide coil  53 . As a result, the vehicle  60  is levitated. 
     Further, when the vehicle  60  is shifted to one side wall  51  of the guideway  50  (a positive side or a negative side thereof in the y direction), a repulsive force is exerted between the superconducting magnet  61  and the levitation/guide coil  53  on the one side wall  51 , and an attractive force is exerted between the superconducting magnet  61  and the levitation/guide coil  53  on the other side wall  51 . As a result, the vehicle  60  is returned to the vicinity of the right and left center of the guideway  50  (the vicinity of the center thereof in the y direction). 
     An anomaly detection system according to the first example embodiment is a system that detects an anomaly of the vehicle  60  or the guideway  50  described above. 
     Next, a configuration example of the anomaly detection system according to the first example embodiment will be described with reference to  FIG.  3   .  FIG.  3    shows a top view of the vehicle  60  and the guideway  50 . Further, in  FIG.  3   , in order to simplify the drawing, the superconducting magnet  61  installed in the vehicle  60  and the propulsion coil  52  and the levitation/guide coil  53  installed in the guideway  50  are not shown (the same applies to  FIGS.  4  to  7  and  13    described below). 
     As shown in  FIG.  3   , the anomaly detection system according to the first example embodiment includes an optical fiber  10 , a reception unit  30 , and an anomaly detection apparatus  40 . Further, the anomaly detection apparatus  40  includes an acquisition unit  41  and a specification unit  32 . Note that the anomaly detection apparatus  40  can be disposed at a position distant from the reception unit  30 . For example, it can be disposed in a cloud. 
     The optical fiber  10  is installed together with a metal wire  20  between the vehicle  60  and each of the side walls  51  of the guideway  50  on the left and right sides thereof (both sides thereof in the y direction) along the direction (the x direction) in which the guideway  50  is extended in such a manner that the optical fiber  10  is in close contact with the metal wire  20 . 
     The metal wire  20  is made of a magnetic material such as iron, nickel, or cobalt that reacts with a magnetic force, and is brought into close contact with the optical fiber  10  as described above. However, the shape of metal with which the optical fiber  10  is brought into close contact is not limited to a linear shape. Therefore, a metal member having a shape other than a linear shape may be installed instead of the metal wire  20 . 
     Conceivable states in which the optical fiber  10  and the metal wire  20  are installed can be broadly divided into two: a state in which they are installed on the guideway  50  side and a state in which they are installed on the vehicle  60  side. 
     First, an example of the state in which the optical fiber  10  and the metal wire  20  are installed on the guideway  50  side will be described with reference to  FIGS.  4  and  5   .  FIG.  4    shows a side view of the vehicle  60  and the guideway  50 , while  FIG.  5    shows a front view of the vehicle  60  and the guideway  50 . Note that, in  FIG.  5   , the reception unit  30  and the anomaly detection apparatus  40  are not shown (the same applies to  FIG.  7    described below). 
     As shown in  FIGS.  4  and  5   , the optical fiber  10  and the metal wire  20  are installed on the side walls  51  of the guideway  50  on the left and right sides thereof (on both sides thereof in the y direction) along the direction (the x direction) in which the guideway  50  is extended. Note that, as described later, the metal wire  20  is installed in order to apply a magnetic force generated between the superconducting magnet  61  installed in the vehicle  60  and the propulsion coil  52  and the levitation/guide coil  53  installed on each of the side walls  51  of the guideway  50  on the left and right side thereof. Therefore, more particularly, the optical fiber  10  and the metal wire  20  are preferably installed between the superconducting magnet  61  and the propulsion coil  52  and the levitation/guide coil  53 . Note that in the state in which the optical fiber  10  and the metal wire  20  are installed on the guideway  50  side, the reception unit  30  is disposed outside the vehicle  60 . 
     Next, an example of the state in which the optical fiber  10  and the metal wire  20  are installed on the vehicle  60  side will be described with reference to  FIGS.  6  and  7   .  FIG.  6    shows a side view of the vehicle  60  and the guideway  50 , while  FIG.  7    shows a front view of the vehicle  60  and the guideway  50 . 
     As shown in  FIGS.  6  and  7   , the optical fiber  10  and the metal wire  20  are installed on the outer side surfaces of the vehicle  60  on the left and right sides thereof (on both sides thereof in the y direction) along the direction (the x direction) in which the guideway  50  is extended. In this example, like in the cases of  FIGS.  4  and  5   , the optical fiber  10  and the metal wire  20  are preferably installed between the superconducting magnet  61  and the propulsion coil  52  and the levitation/guide coil  53 . Note that in the state in which the optical fiber  10  and the metal wire  20  are installed on the vehicle  60  side, the reception unit  30  is disposed inside the vehicle  60 . 
     Note that, in  FIGS.  4  to  7   , although the optical fiber  10  is disposed closer to the sides of the side walls  51  of the guideway  50  (the positive side or the negative side in the y direction) than the metal wire  20  is, the present disclosure is not limited thereto. The optical fiber  10  may be disposed closer to the vehicle  60  side (the negative side or the positive side in the y direction) than the metal wire  20  is. Further, the optical fiber  10  may be disposed at the upper or lower end of the metal wire  20 . 
     Further, in  FIGS.  3  to  7   , although two optical fibers  10  are respectively installed in the vehicle  60  on the left and right sides thereof (both sides thereof in the y direction), the present disclosure is not limited thereto. When it is necessary to detect an anomaly of the vehicle  60  or the guideway  50  on only one of the left and right sides (the positive side or the negative side in the y direction) of the vehicle  60 , one optical fiber  10  may be installed on only one of the left and right sides of the vehicle  60 . Further, as shown in  FIG.  8   , one optical fiber  10  may be installed so as to surround the vehicle  60  and an area around the vehicle  60 . In this case, it is possible to detect an anomaly of the vehicle  60  or the guideway  50  on both right and left sides of the vehicle  60  (both sides thereof in the y direction) by one optical fiber  10 . 
     Further, the optical fiber  10  may be an optical fiber dedicated to sensing or an optical fiber used for both communication and sensing. When the optical fiber  10  is an optical fiber for both communication and sensing, an optical signal for sensing is demultiplexed by a filter (not shown) at the previous stage of the reception unit  30 , so that the reception unit  30  can receive only the optical signal for sensing. 
     The reception unit  30  receives an optical signal, i.e., an optical signal for sensing (hereinafter, an optical signal) from the optical fiber  10 . For example, the reception unit  30  receives, as an optical signal, backscattered light generated by making pulsed light incident on the optical fiber  10  and transmitting it through the optical fiber  10 . 
     As described above, a magnetic force is generated between the vehicle  60  and the side wall  51  of the guideway  50  during the traveling of the vehicle  60  by the magnetic reaction between the superconducting magnet  61  and the propulsion coil  52  and the levitation/guide coil  53 . 
     Further, the metal wire  20  made of a magnetic material, such as iron, nickel, or cobalt, which reacts with a magnetic force, is provided between the vehicle  60  and the side wall  51  of the guideway  50 . By doing so, the metal wire  20  generates vibration, heat, and sound due to the effect of the above-mentioned magnetic force during the traveling of the vehicle  60 . 
     Further, vibration, heat generation temperature, and sound generated in the metal wire  20  are transmitted to the optical fiber  10  in close contact with the metal wire  20  due to the effect of the magnetic force. As a result, the backscattered light generated when the pulse light made incident on the optical fiber  10  is transmitted through the optical fiber  10  changes, and thus the characteristics of the optical signal received by the reception unit  30  change. 
     Therefore, the optical fiber  10  can detect the effect of the magnetic force received by the metal wire  20 , and thus the optical signal received by the reception unit  30  includes information indicating the effect of the magnetic force received by the metal wire  20 , the information being detected by the optical fiber  10 . Note that the information indicating the effect of the magnetic force received by the metal wire  20  may be information indicating at least one of vibration, heat generation temperature, and sound. 
     Note that, in the vehicle  60  and the guideway  50 , an anomaly may occur, for example, at the timing when the current is made to flow through the superconducting magnet  61  and the propulsion coil  52 , or in the switching operation of the magnetic poles of the propulsion coil  52 . Further, an anomaly such as deterioration of the superconducting magnet  61 , the propulsion coil  52 , and the levitation/guide coil  53  or an installation of suspicious objects on the guideway  50  may occur. When such an anomaly has occurred, the magnetic force generated between the vehicle  60  and the side wall  51  of the guideway  50  changes, and as a result, the effect of the magnetic force received by the metal wire  20  also changes. 
     Therefore, a detection unit  42  can detect an anomaly of the vehicle  60  or the guideway  50  by analyzing information indicating the effect of the magnetic force received by the metal wire  20 , the information being included in the optical signal received by the reception unit  30 . 
     Therefore, the acquisition unit  41  acquires information indicating the effect of the magnetic force received by the metal wire  20 , the information being included in the optical signal received by the reception unit  30 . Then the detection unit  42  detects an anomaly of the vehicle  60  or the guideway  50  based on the information indicating the effect of the magnetic force received by the metal wire  20 , the information being acquired by the acquisition unit  41 . 
     Note that the time at which the vehicle  60  passes the guideway  50 , that is, the time at which an anomaly can be detected, varies in accordance with the length, the speed, and the like of the vehicle  60 . Therefore, in order to ensure a constant diagnostic accuracy, the transmission (incidence) period of the pulse light may be changed in accordance with the number of vehicles  60 , the traveling speed of the vehicle  60 , and the like. 
     An example of a method by which the detection unit  42  detects an anomaly of the vehicle  60  or the guideway  50  will be described in detail below. 
     Information indicating the effect of the magnetic force received by the metal wire  20 , which information is detected by the optical fiber  10 , includes a vibration pattern of the vibration, a temperature pattern of the heat generation temperature, and an acoustic pattern of the sound, which vibration, heat generation temperature, and sound are generated in the metal wire  20  due to the effect of the magnetic force. The above vibration pattern, temperature pattern, and acoustic pattern are fluctuation patterns which dynamically fluctuate. Further, when an anomaly has occurred in the vehicle  60  or the guideway  50 , the vibration pattern, the temperature pattern, and the acoustic pattern are fluctuation patterns, each of which is unique to the type of the anomaly that has occurred. Among these patterns, for example, the vibration pattern is a unique fluctuation pattern in which the transitions in the fluctuations in the strength of the vibration, the position of the vibration, the number of times of vibrations, and the like differ in accordance with the type of the anomaly that has occurred. 
     That is, when an anomaly has occurred in the vehicle  60  or the guideway  50 , information indicating the effect of the magnetic force received by the metal wire  20 , which information is detected by the optical fiber  10 , includes the unique vibration pattern, temperature pattern, and acoustic pattern which dynamically fluctuate in accordance with the type of the anomaly that has occurred. By utilizing this feature, the detection unit  42  detects an anomaly of the vehicle  60  or the guideway  50  by the following methods. One example in which an anomaly of the vehicle  60  or the guideway  50  is detected using the vibration pattern will be described below. 
     (A) Method A 
     For each type of an anomaly to be detected, the detection unit  42  stores a vibration pattern of vibration which is actually generated in the metal wire  20  when the anomaly has occurred and is detected by the detection unit  42  as a matching pattern in advance in a memory or the like (not shown). 
     First, the acquisition unit  41  acquires information indicating the effect of the magnetic force received by the metal wire  20 , the information being included in the optical signal received by the reception unit  30 . 
     Next, the detection unit  42  compares the vibration pattern included in the information acquired by the acquisition unit  41  with the matching pattern. When there is a matching pattern in which the matching rate with the vibration pattern is equal to or larger than a threshold among the matching patterns, the detection unit  42  determines that an anomaly corresponding to the matching pattern has occurred. 
     (B) Method B 
     For each type of an anomaly to be detected, the detection unit  42  prepares a set of training data indicating the anomaly and a vibration pattern of vibration which is actually generated in the metal wire  20  when the anomaly has occurred and is detected by the detection unit  42 . Then the detection unit  42  inputs the prepared sets to construct a learning model by a Convolutional Neural Network (CNN) in advance, and stores the learning model in a memory or the like (not shown) in advance. 
     First, the acquisition unit  41  acquires information indicating the effect of the magnetic force received by the metal wire  20 , the information being included in the optical signal received by the reception unit  30 . 
     Next, the detection unit  42  inputs the vibration pattern included in the information acquired by the acquisition unit  41  to the learning model. By doing so, when an anomaly to be detected has occurred in the vehicle  60  or the guideway  50 , the detection unit  42  obtains information about the anomaly that has occurred in the vehicle  60  or the guideway  50  as a result output from the learning model. 
     As described above, according to the above-described methods A and B, the detection unit  42  can not only determine that an anomaly has occurred in the vehicle  60  or the guideway  50 , but can also specify the type of the anomaly that has occurred. 
     Next, an example of a flow of operations performed by the anomaly detection system according to the first example embodiment will be described with reference to  FIG.  9   . 
     As shown in  FIG.  9   , the reception unit  30  receives, from the optical fiber  10  that detects a state of the metal wire  20  affected by a magnetic force generated between the vehicle  60  and the guideway  50 , an optical signal including information indicating the effect of the magnetic force received by the metal wire  20  (Step S 11 ). 
     Next, the acquisition unit  41  acquires information indicating the effect of the magnetic force received by the metal wire  20 , the information being included in the optical signal received by the reception unit  30 , and the detection unit  42  detects an anomaly of the vehicle  60  or the guideway  50  based on the information indicating the effect of the magnetic force received by the metal wire  20  (Step S 12 ). This Step S 12  may be performed, for example, by using one of the above-described methods A and B. 
     As described above, according to the first example embodiment, the reception unit  30  receives, from the optical fiber  10  that detects a state of the metal wire  20  affected by a magnetic force generated between the vehicle  60  and the guideway  50  of the magnetically levitated train, an optical signal including information indicating the effect of the magnetic force received by the metal wire  20 . The detection unit  42  detects an anomaly of the vehicle  60  or the guideway  50  based on information indicating the effect of the magnetic force received by the metal wire  20 , the information being included in the optical signal. 
     In this way, it is possible to detect an anomaly of the vehicle  60  or the guideway  50  of the magnetically levitated train. 
     Further, since the anomaly detection apparatus  40  can be located distant from the reception unit  30 , it is possible to remotely detect an anomaly of the vehicle  60  or the guideway  50  of the magnetically levitated train in real time. 
     Second Example Embodiment 
     Although the configuration of an anomaly detection system according to a second example embodiment is similar to that of the first example embodiment described above, the number of functions of the detection unit  42  included therein is increased. 
     In the first example embodiment described above, although the detection unit  42  can determine that an anomaly has occurred in the vehicle  60  or the guideway  50 , it cannot determine whether the anomaly has occurred in the vehicle  60  or it has occurred in the guideway  50 . 
     Therefore, in the second example embodiment, the detection unit  42  has an additional function of determining, when it determines that an anomaly has occurred in the vehicle  60  or the guideway  50 , whether the anomaly has occurred in the vehicle  60  or it has occurred in the guideway  50 . Further, the detection unit  42  has an additional function of specifying an occurrence location where the anomaly has occurred. 
     An example of a method by which the detection unit  42  determines whether an anomaly has occurred in the vehicle  60  or it has occurred in the guideway  50  and an example of a method by which the detection unit  42  specifies an occurrence location where the anomaly has occurred will be described in detail below. Note that these methods change according to whether the optical fiber  10  and the metal wire  20  are installed on the guideway  50  side or on the vehicle  60  side. Therefore, the method in the case in which the optical fiber  10  and the metal wire  20  are installed on the guideway  50  side and the method in the case in which they are installed on the vehicle  60  side will each be respectively described below. 
     (a) Case in which the Optical Fiber  10  and the Metal Wire  20  are Installed on the Guideway  50  Side 
     First, an example of the above-described method in the case in which the optical fiber  10  and the metal wire  20  are installed on the guideway  50  side will be described with reference to  FIG.  10   . Note that  FIG.  10    shows an example in which a magnetically levitated train composed of a plurality of vehicles  60  connected thereto travels along the optical fiber  10  in a direction away from the reception unit  30 . 
     The detection unit  42  can specify the position (the distance of the optical fiber  10  from the reception unit  30 ) where an optical signal is generated by using the following method. For example, the detection unit  42  can specify the position where an optical signal is generated based on a time difference between the time when the reception unit  30  makes the pulse light incident on the optical fiber  10  and the time when the reception unit  30  receives the optical signal from the optical fiber  10 . Alternatively, the detection unit  42  can specify the position where the optical signal is generated based on the reception strength of the optical signal received by the reception unit  30 . For example, the detection unit  42  specifies that the smaller the reception strength of the optical signal becomes, the farther the position where the optical signal is generated is from the position of the reception unit  30 . Note that the specification of the location where the optical signal is generated is not limited to being performed by the detection unit  42 . For example, the reception unit  30  may specify the location where the optical signal is generated, and the acquisition unit  41  may acquire information about the location where the optical signal is generated from the reception unit  30 . 
     The detection unit  42  can specify the position (the distance of the optical fiber  10  from the reception unit  30 ) where an optical signal is generated by using the method described above. Therefore, the detection unit  42  can specify an optical signal generated at any position. 
     In this example, a plurality of sensing points are set at predetermined intervals on the optical fiber  10  installed on the guideway  50  side. Then the detection unit  42  specifies an optical signal generated at each of the plurality of sensing points, and detects an anomaly of the vehicle  60  or the guideway  50  based on information indicating the effect of the magnetic force received by the metal wire  20 , the information being included in the specified optical signal. 
     It is assumed that when an anomaly is detected at the sensing point on the optical fiber  10  installed on the guideway  50  side, the position of the sensing point (the distance of the optical fiber  10  from the reception unit  30 ) and the time when the anomaly is detected at the sensing point are specified and the specified position and time are plotted on a graph. Then, for example, a graph showing characteristics as shown in  FIG.  10    is obtained. 
     In the example shown in the upper part of  FIG.  10   , an anomaly is continuously detected a plurality of times at one sensing point on the optical fiber  10  installed on the guideway  50  side. In this case, the detection unit  42  determines that an anomaly has occurred on the guideway  50  side. Further, the detection unit  42  specifies the position of the sensing point where the anomaly is detected as a location where the anomaly has occurred. Note that, in the example shown in the upper part of  FIG.  10   , the detection unit  42  determines, when an anomaly is detected only at one sensing point on the optical fiber  10 , that the anomaly has occurred on the guideway  50  side. However, the present disclosure is not limited thereto. For example, the detection unit  42  may determine, when an anomaly is detected only at a predetermined number or less of sensing points on the optical fiber  10 , that the anomaly has occurred on the guideway  50  side. 
     On the other hand, in the example shown in the lower part of  FIG.  10   , an anomaly is detected continuously over time at a plurality of sensing points on the optical fiber  10  installed on the guideway  50  side. In this case, the detection unit  42  determines that an anomaly has occurred on the vehicle  60  side. Further, the detection unit  42  acquires, from a management center or the like that manages the magnetically levitated train, position information of the vehicle  60  at the time when the anomaly is detected at any sensing point among the plurality of sensing points where the anomaly is detected. Then the detection unit  42  specifies which part (part in the x direction) of the vehicle  60  has passed through any sensing point on the guideway  50  side at the time when the anomaly is detected, and specifies (i.e., determines) the specified part of the vehicle  60  as a location where the anomaly has occurred. 
     (b) Case in which the Optical Fiber  10  and the Metal Wire  20  are Installed on the Vehicle  60  Side 
     Next, an example of the above-described method in the case in which the optical fiber  10  and the metal wire  20  are installed on the vehicle  60  side will be described with reference to  FIG.  11   . Note that  FIG.  11    shows an example in which a magnetically levitated train composed of a plurality of vehicles  60  connected thereto travels along the optical fiber  10  in a direction away from the reception unit  30 . 
     In this example, like in the case of  FIG.  10   , a plurality of sensing points are set at predetermined intervals on the optical fiber  10  installed on the vehicle  60  side. Then the detection unit  42  specifies an optical signal generated at each of the plurality of sensing points, and detects an anomaly of the vehicle  60  or the guideway  50  based on information indicating the effect of the magnetic force received by the metal wire  20 , the information being included in the specified optical signal. 
     Further, like in the case of  FIG.  10   , it is assumed that when an anomaly is detected at the sensing point on the optical fiber  10  installed on the vehicle  60  side, the position of the sensing point (the distance of the optical fiber  10  from the reception unit  30 ) and the time when the anomaly is detected at the sensing point are specified and the specified position and time are plotted on a graph. Then, for example, a graph showing characteristics as shown in  FIG.  11    is obtained. 
     In the example shown in the upper part of  FIG.  11   , an anomaly is continuously detected a plurality of times at one sensing point on the optical fiber  10  installed on the vehicle  60  side. In this case, the detection unit  42  determines that an anomaly has occurred on the vehicle  60  side. Further, the detection unit  42  specifies the position of the sensing point where the anomaly is detected as a location where the anomaly has occurred. Note that, in the example shown in the upper part of  FIG.  11   , the detection unit  42  determines, when an anomaly is detected only at one sensing point on the optical fiber  10 , that the anomaly has occurred on the vehicle  60  side. However, the present disclosure is not limited thereto. For example, the detection unit  42  may determine, when an anomaly is detected only at a predetermined number or less of sensing points on the optical fiber  10 , that the anomaly has occurred on the vehicle  60  side. 
     On the other hand, in the example shown in the lower part of  FIG.  11   , an anomaly is detected continuously over time at a plurality of sensing points on the optical fiber  10  installed on the vehicle  60  side. In this case, the detection unit  42  determines that an anomaly has occurred on the guideway  50  side. Further, the detection unit  42  acquires, from a management center or the like, position information of the vehicle  60  at the time when the anomaly is detected at any sensing point among the plurality of sensing points where the anomaly is detected. Then the detection unit  42  specifies which part (part in the x-direction) of the guideway  50  any sensing point on the vehicle  60  side has passed at the time when the anomaly is detected, and specifies (i.e., determines) the specified part of the guideway  50  as a location where the anomaly has occurred. 
     Next, an example of a flow of operations performed by the anomaly detection system according to the second example embodiment will be described with reference to  FIG.  12   . 
     As shown in  FIG.  12   , the reception unit  30  receives, from the optical fiber  10  that detects a state of the metal wire  20  affected by a magnetic force generated between the vehicle  60  and the guideway  50 , an optical signal including information indicating the effect of the magnetic force received by the metal wire  20 (Step S 21 ). 
     Next, the acquisition unit  41  acquires information indicating the effect of the magnetic force received by the metal wire  20 , the information being included in the optical signal received by the reception unit  30 , and the detection unit  42  detects an anomaly of the vehicle  60  or the guideway  50  based on the information indicating the effect of the magnetic force received by the metal wire  20  (Step S 22 ). This Step S 22  may be performed, for example, by using one of the above-described methods A and B. 
     If the detection unit  42  determines in Step S 22  that an anomaly has occurred in the vehicle  60  or the guideway  50  (Yes in Step S 22 ), then it determines whether the anomaly has occurred in the vehicle  60  or it has occurred in the guideway  50  based on the optical signal received by the reception unit  30  (Step S 23 ). Further, the detection unit  42  specifies an occurrence location where the anomaly has occurred based on the optical signal received by the reception unit  30  and the position of the vehicle  60  when the anomaly has occurred (Step S 24 ). These Steps S 23  and S 24  may be performed, for example, by using one of the methods described with reference to  FIG.  10    or  FIG.  11   . 
     As described above, according to the second example embodiment, when the detection unit  42  determines that an anomaly has occurred in the vehicle  60  or the guideway  50  of the magnetically levitated train, it determines whether the anomaly has occurred in the vehicle  60  or it has occurred in the guideway  50  based on the optical signal received by the reception unit  30 . Further, the detection unit  42  specifies an occurrence location where the anomaly has occurred based on the optical signal received by the reception unit  30  and the position of the vehicle  60  when the anomaly has occurred. 
     By doing so, it is possible to determine whether an anomaly has occurred in the vehicle  60  of the magnetically levitated train or it has occurred in the guideway  50  of the magnetically levitated train and to specify the location where the anomaly has occurred. 
     Effects other than the above ones are similar to those of the above-described first example embodiment. 
     Third Example Embodiment 
     Next, a configuration example of an anomaly detection system according to a third example embodiment will be described with reference to  FIG.  13   . 
     As shown in  FIG.  13   , the configuration of the anomaly detection system according to the third example embodiment differs from the above-described configurations of the first and the second example embodiments in that a notification unit  43  is additionally provided inside the anomaly detection apparatus  40 . In  FIG.  13   , two optical fibers  10  are respectively installed in the vehicle  60  on the left and right sides thereof (both sides thereof in the y direction). However, as shown in  FIG.  8   , one optical fiber  10  may be installed so as to surround the vehicle  60  and an area around the vehicle  60 . In this case, it is possible to detect, on both right and left sides of the vehicle  60  (both sides of the vehicle  60  in the y direction), an anomaly of the vehicle  60  or the guideway  50  by one optical fiber  10 . 
     When the detection unit  42  determines that an anomaly has occurred in the vehicle  60  or the guideway  50 , the notification unit  43  notifies a notification destination terminal (not shown) that the anomaly has occurred. The notification destination terminal is, for example, a terminal installed in a management center that manages the magnetically levitated train, a station, a train operator&#39;s cabin of the vehicle  60 , or a terminal carried by a train operator who operates the magnetically levitated train. As the notification method, for example, a method in which a Graphical User Interface (GUI) screen is displayed on a display, a monitor, or the like of the notification destination terminal, and a method in which a message is output by voice from a speaker of the notification destination terminal may be employed. 
     Further, like in the case of the second example embodiment described above, when the detection unit  42  has a function of determining whether an anomaly has occurred in the vehicle  60  or it has occurred in the guideway  50 , and a function of specifying an occurrence location where the anomaly has occurred, the notification unit  43  may, in addition to sending the above-described notification, notify the terminal about whether the anomaly has occurred in the vehicle  60  or it has occurred in the guideway  50 , and may notify the terminal about the location where the anomaly has occurred. 
     Further, like in the case of the second example embodiment described above, when the detection unit  42  has a function of determining whether an anomaly has occurred in the vehicle  60  or it has occurred in the guideway  50 , the notification unit  43  may notify the notification destination terminal that an anomaly has occurred, which notification destination terminal differs depending on whether the anomaly has occurred in the vehicle  60  or it has occurred in the guideway  50 . For example, it is conceivable that the notification unit  43  may send a notification to a terminal installed in a train operator&#39;s cabin or a terminal carried by a train operator when an anomaly has occurred in the vehicle  60 , while it may send a notification to a terminal installed in a management center or a station when an anomaly has occurred in the guideway  50 . 
     Next, an example of a flow of operations performed by the anomaly detection system according to the third example embodiment will be described with reference to  FIG.  14   . 
     As shown in  FIG.  14   , the reception unit  30  receives, from the optical fiber  10  that detects a state of the metal wire  20  affected by a magnetic force generated between the vehicle  60  and the guideway  50 , an optical signal including information indicating the effect of the magnetic force received by the metal wire  20  (Step S 31 ). 
     Next, the acquisition unit  41  acquires information indicating the effect of the magnetic force received by the metal wire  20 , the information being included in the optical signal received by the reception unit  30 , and the detection unit  42  detects an anomaly of the vehicle  60  or the guideway  50  based on the information indicating the effect of the magnetic force received by the metal wire  20  (Step S 32 ). This Step S 32  may be performed, for example, by using one of the above-described methods A and B. 
     If the detection unit  42  determines in Step S 32  that an anomaly has occurred in the vehicle  60  or the guideway  50  (Yes in Step S 32 ), then the notification unit  43  notifies a notification destination terminal that the anomaly has occurred (Step S 33 ). At this time, if the detection unit  42  has the above-described function according to the second example embodiment, the notification unit  43  may, in addition to sending the above-described notification, notify the terminal about whether the anomaly has occurred in the vehicle  60  or it has occurred in the guideway  50 , and may notify the terminal about the location where the anomaly has occurred. Further, the notification unit  43  may notify the notification destination terminal that an anomaly has occurred, which notification destination terminal differs depending on whether the anomaly has occurred in the vehicle  60  or it has occurred in the guideway  50 . 
     As described above, according to the third example embodiment, when the detection unit  42  determines that an anomaly has occurred in the vehicle  60  or the guideway  50  of the magnetically levitated train, the notification unit  43  notifies a notification destination terminal that the anomaly has occurred. 
     By doing so, it is possible to notify the notification destination terminal that an anomaly has occurred in the vehicle  60  or the guideway  50  of the magnetically levitated train. 
     Effects other than the above ones are similar to those of the above-described first example embodiment. 
     Other Example Embodiments 
     In the above-described example embodiments, when the optical fiber  10  and the metal wire  20  are installed on the vehicle  60  side, the optical fiber  10  and the metal wire  20  are installed on the side surface of the vehicle  60 . However, the present disclosure is not limited thereto. The optical fiber  10  and the metal wire  20  may be installed at a position where the metal wire  20  is affected by a magnetic force generated between the vehicle  60  and the side wall  51  of the guideway  50 . Therefore, the optical fiber  10  and the metal wire  20  may be installed at a position in an upper part or a lower part of the vehicle  60  where the metal wire  20  is affected by the magnetic force. Further, the optical fiber  10  and the metal wire  20  are not limited to being installed outside the vehicle  60 , and may be installed inside the vehicle  60  at a position where the metal wire  20  is affected by the magnetic force. 
     Further, in the above-described example embodiments, when an anomaly has occurred in the vehicle  60  or the guideway  50 , the notification unit  43  notifies a notification destination terminal that the anomaly has occurred. However, the present disclosure is not limited thereto. When an anomaly has occurred in the vehicle  60  or the guideway  50 , the vehicle  60  may be controlled so that, for example, the speed of the vehicle  60  is reduced or the vehicle  60  is stopped. Such control of the vehicle  60  may be performed by a control unit (not shown) or by the notification unit  43 . 
     Further, in the above-described example embodiments, the detection unit  42  may periodically detect an anomaly of the vehicle  60  or the guideway  50 . At this time, the detection unit  42  may specify the state of the vehicle  60  or the guideway  50  and maintain the specified state even when it determines that no anomaly has occurred based on information indicating the effect of the magnetic force received by the metal wire  20 . Then the detection unit  42  may detect a sign of an anomaly of the vehicle  60  or the guideway  50  based on changes in the state over time. 
     Further, in the above-described example embodiments, the detection unit  42  detects an anomaly of the vehicle  60  or the guideway  50  based on the effect of the magnetic force received by the metal wire  20 . However, the present disclosure is not limited thereto. For example, when the optical fiber  10  is installed on the guideway  50  side, the optical fiber  10  can detect the passage of the vehicle  60 , landslides, the entry of animals and persons into the guideway  50 , vibrations caused by earthquakes etc., the temperature of the guideway  50  itself, abnormal noises in the surroundings of the guideway  50 , and the like, and these information pieces detected by the optical fiber  10  are also included in the optical signal. Therefore, the detection unit  42  may detect the passage of the vehicle  60 , landslides, and the like based on these information pieces. Further, when the optical fiber  10  is installed on the vehicle  60  side, the optical fiber  10  can detect vibrations and the temperature of the vehicle  60  itself, sounds of the vehicle  60  itself during traveling or stopping, and the like, and these information pieces detected by the optical fiber  10  are also included in the optical signal. Therefore, the detection unit  42  may detect the state of the vehicle  60  based on these information pieces. 
     Further, in the above-described example embodiments, the reception unit  30  and the anomaly detection apparatus  40  are separated. However, the present disclosure is not limited thereto. The reception unit  30  and the anomaly detection apparatus  40  may be integrated with each other, so that the reception unit  30  is provided inside the anomaly detection apparatus  40 .  FIG.  15    shows a configuration example of an anomaly detection system in which the reception unit  30  is provided inside the anomaly detection apparatus  40 . In the example of  FIG.  15   , since the reception unit  30  and the detection unit  42  are provided inside the same anomaly detection apparatus  40 , the acquisition unit  41  is removed. Note that, in the anomaly detection system shown in  FIG.  15   , like in the case of the third example embodiment described above, the notification unit  43  may be additionally provided inside the anomaly detection apparatus  40 . 
     Further, in the above-described example embodiments, one reception unit  30  and one anomaly detection apparatus  40  are provided in two optical fibers  10  installed in the vehicle  60  on both right and left sides thereof (both sides thereof in the y direction) or in one optical fiber  10  installed so as to surround the vehicle  60  and an area around the vehicle  60 . However, the present disclosure is not limited thereto. For example, when a plurality of optical fibers  10  are provided, a plurality of reception units  30  and a plurality of anomaly detection apparatuses  40 , each of which corresponds to a respective one of the plurality of optical fibers  10 , may be provided. 
     &lt;Hardware Configuration of the Anomaly Detection Apparatus According to the Example Embodiments&gt; 
     Next, a hardware configuration of a computer  70  that implements the anomaly detection apparatus  40  according to the above-described example embodiments will be described with reference to  FIG.  16   . 
     As shown in  FIG.  16   , the computer  70  includes a processor  701 , a memory  702 , a storage  703 , an input/output interface (an input/output I/F)  704 , a communication interface (communication I/F)  705 , and the like. The processor  701 , the memory  702 , the storage  703 , the input/output interface  704 , and the communication interface  705  are connected to each other through data transmission lines through which they transmit/receive data to/from each other. 
     The processor  701  is, for example, an arithmetic processing unit such as a Central Processing Unit (CPU) or a Graphics Processing Unit (GPU). The memory  702  is, for example, a memory such as a Random Access Memory (RAM) or a Read Only Memory (ROM). The storage  703  is, for example, a storage device such as a Hard Disk Drive (HDD), a Solid State Drive (SSD), or a memory card. Further, the storage  703  may be a memory such as a RAM or a ROM. 
     The storage  703  stores programs for implementing the functions of the components included in the anomaly detection apparatus  40 . The processor  701  implements the function of each of the components included in the anomaly detection apparatus  40  by executing the respective programs. Note that when the processor  701  executes these respective programs, it may execute the programs after loading them onto the memory  702  or may execute the programs without loading them onto the memory  702 . Further, the memory  702  and the storage  703  also have a function of storing information and data held by the components included in the anomaly detection apparatus  40 . 
     Further, the above-described program(s) can be stored and provided to a computer (including the computer  70 ) using any type of non-transitory computer readable media. Non-transitory computer readable media include any type of tangible storage media. Examples of non-transitory computer readable media include magnetic storage media (such as floppy disks, magnetic tapes, hard disk drives, etc.), optical magnetic storage media (e.g., magneto-optical disks), CD-ROM (Compact Disc-ROM), CD-R (CD-Recordable), CD-R/W (CD-ReWritable), and semiconductor memories (such as mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM, etc.). Further, the program(s) may be provided to a computer using any type of transitory computer readable media. Examples of transitory computer readable media include electric signals, optical signals, and electromagnetic waves. Transitory computer readable media can provide the program(s) to a computer via a wired communication line (e.g., electric wires and optical fibers) or a wireless communication line. 
     The input/output interface  704  is connected to a display apparatus  7041 , an input apparatus  7042 , a sound output apparatus  7043 , and the like. The display apparatus  7041  is an apparatus, such as a Liquid Crystal Display (LCD), a Cathode Ray Tube (CRT) display, or a monitor, which displays an image corresponding to drawing data processed by the processor  701 . The input apparatus  7042  is an apparatus that receives an operation input from an operator, and is, for example, a keyboard, a mouse, and a touch sensor. The display apparatus  7041  and the input apparatus  7042  may be integrated with each other and hence implemented as a touch panel. The sound output apparatus  7043  is an apparatus, such as a speaker, which outputs sounds corresponding to acoustic data processed by the processor  701 . 
     The communication interface  705  transmits and receives data to and from an external apparatus. For example, the communication interface  705  communicates with an external apparatus through a wired communication line or a wireless communication line. 
     Although the present disclosure has been described with reference to the example embodiments, the present disclosure is not limited to the above-described example embodiments. Various changes that may be understood by those skilled in the art may be made to the configurations and details of the present disclosure within the scope of the disclosure. 
     For example, the whole or part of the above example embodiments may be used in combination with each other. 
     Further, the whole or part of the example embodiments disclosed above can be described as, but not limited to, the following supplementary notes. 
     (Supplementary Note 1) 
     An anomaly detection system comprising: 
     an optical fiber configured to detect a state of a metal member affected by a magnetic force generated between a vehicle and a guideway of a magnetically levitated train; 
     a reception unit configured to receive, from the optical fiber, an optical signal including information indicating an effect of the magnetic force received by the metal member; and 
     a detection unit configured to detect an anomaly of the vehicle or the guideway based on the information indicating the effect of the magnetic force received by the metal member, the information being included in the optical signal. 
     (Supplementary Note 2) 
     The anomaly detection system according to Supplementary note 1, wherein the information indicating the effect of the magnetic force received by the metal member includes at least one of vibration, heat generation temperature, and sound of the metal member generated by the magnetic force. 
     (Supplementary Note 3) 
     The anomaly detection system according to Supplementary note 1 or 2, wherein when the detection unit determines that an anomaly has occurred in the vehicle or the guideway, the detection unit determines whether the anomaly has occurred in the vehicle or it has occurred in the guideway based on the optical signal. 
     (Supplementary Note 4) 
     The anomaly detection system according to Supplementary note 3, wherein when the detection unit determines that an anomaly has occurred in the vehicle or the guideway, the detection unit specifies an occurrence location where the anomaly has occurred based on the optical signal and a position of the vehicle at a time when the anomaly has occurred. 
     (Supplementary Note 5) 
     The anomaly detection system according to Supplementary note 3 or 4, further comprising a notification unit configured to send, when the detection unit determines that an anomaly has occurred in the vehicle or the guideway, a notification that the anomaly has occurred. 
     (Supplementary Note 6) 
     The anomaly detection system according to Supplementary note 5, wherein the notification unit notifies a notification destination terminal that an anomaly has occurred, which notification destination terminal differs depending on whether the anomaly has occurred in the vehicle or it has occurred in the guideway. 
     (Supplementary Note 7) 
     An anomaly detection apparatus comprising: 
     an acquisition unit configured to acquire information indicating an effect of a magnetic force received by a metal member, the information being included in an optical signal received from an optical fiber configured to detect a state of the metal member affected by the magnetic force generated between a vehicle and a guideway of a magnetically levitated train; and 
     a detection unit configured to detect an anomaly of the vehicle or the guideway based on the information indicating the effect of the magnetic force received by the metal member. 
     (Supplementary Note 8) 
     The anomaly detection apparatus according to Supplementary note 7, wherein the information indicating the effect of the magnetic force received by the metal member includes at least one of vibration, heat generation temperature, and sound of the metal member generated by the magnetic force. 
     (Supplementary Note 9) 
     The anomaly detection apparatus according to Supplementary note 7 or 8, wherein when the detection unit determines that an anomaly has occurred in the vehicle or the guideway, the detection unit determines whether the anomaly has occurred in the vehicle or it has occurred in the guideway based on the optical signal. 
     (Supplementary Note 10) 
     The anomaly detection apparatus according to Supplementary note 9, wherein when the detection unit determines that an anomaly has occurred in the vehicle or the guideway, the detection unit specifies an occurrence location where the anomaly has occurred based on the optical signal and a position of the vehicle at a time when the anomaly has occurred. 
     (Supplementary Note 11) 
     The anomaly detection apparatus according to Supplementary note 9 or 10, further comprising a notification unit configured to send, when the detection unit determines that an anomaly has occurred in the vehicle or the guideway, a notification that the anomaly has occurred. 
     (Supplementary Note 12) 
     The anomaly detection apparatus according to Supplementary note 11, wherein the notification unit notifies a notification destination terminal that an anomaly has occurred, which notification destination terminal differs depending on whether the anomaly has occurred in the vehicle or it has occurred in the guideway. 
     (Supplementary Note 13) 
     An anomaly detection method performed by an anomaly detection system, the anomaly detection method comprising: 
     a reception step of receiving, from an optical fiber configured to detect a state of a metal member affected by a magnetic force generated between a vehicle and a guideway of a magnetically levitated train, an optical signal including information indicating an effect of the magnetic force received by the metal member; and 
     a detection step of detecting an anomaly of the vehicle or the guideway based on the information indicating the effect of the magnetic force received by the metal member, the information being included in the optical signal. 
     (Supplementary Note 14) 
     The anomaly detection method according to Supplementary note 13, wherein the information indicating the effect of the magnetic force received by the metal member includes at least one of vibration, heat generation temperature, and sound of the metal member generated by the magnetic force. 
     (Supplementary Note 15) 
     The anomaly detection method according to Supplementary note 13 or 14, wherein in the detection step, when it is determined that an anomaly has occurred in the vehicle or the guideway, it is determined whether the anomaly has occurred in the vehicle or it has occurred in the guideway based on the optical signal. 
     (Supplementary Note 16) 
     The anomaly detection method according to Supplementary note 15, wherein in the detection step, when it is determined that an anomaly has occurred in the vehicle or the guideway, an occurrence location where the anomaly has occurred is specified based on the optical signal and a position of the vehicle at a time when the anomaly has occurred. 
     (Supplementary Note 17) 
     The anomaly detection method according to Supplementary note 15 or 16, further comprising a notification step of sending, when it is determined in the detection step that an anomaly has occurred in the vehicle or the guideway, a notification that the anomaly has occurred. 
     (Supplementary Note 18) 
     The anomaly detection method according to Supplementary note 17, wherein in the notification step, a notification that an anomaly has occurred is sent to a notification destination terminal, which notification destination terminal differs depending on whether the anomaly has occurred in the vehicle or it has occurred in the guideway. 
     This application is based upon and claims the benefit of priority from Japanese patent application No. 2020-060394, filed on Mar. 30, 2020, the disclosure of which is incorporated herein in its entirety by reference. 
     REFERENCE SIGNS LIST 
     
         
           10  OPTICAL FIBER 
           20  METAL WIRE 
           30  RECEPTION UNIT 
           40  ANOMALY DETECTION APPARATUS 
           41  ACQUISITION UNIT 
           42  DETECTION UNIT 
           43  NOTIFICATION UNIT 
           50  GUIDEWAY 
           51  SIDE WALL 
           52  PROPULSION COIL 
           53  LEVITATION/GUIDE COIL 
           60  VEHICLE 
           61  SUPERCONDUCTING MAGNET 
           70  COMPUTER 
           701  PROCESSOR 
           702  MEMORY 
           703  STORAGE 
           704  INPUT/OUTPUT INTERFACE 
           7041  DISPLAY APPARATUS 
           7042  INPUT APPARATUS 
           7043  SOUND OUTPUT APPARATUS 
           705  COMMUNICATION INTERFACE