Patent Publication Number: US-2022229031-A1

Title: Titration module, test apparatus and method for measuring titration contact angles

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a titration module, a test apparatus, and a measuring method, and more particularly, to a titration module, a test apparatus, and a method which are used for measuring titration contact angles. 
     2. Description of Related Art 
     Generally speaking, a biosensor performs biological tests by titrating test solution on the induction zone of a unit under test. An induction zone normally has a surface of microporous material, such that when test solution is titrated on the induction zone, globules having specific contact angles can be formed thereon. Therefore, in case the units under test become defective in the manufacturing process, problems will be incurred such as uneven coating, disuniform dimensions for the microelectromechanical systems (MEMS) structure of the surface layer. This results in abnormal contact angles of the globules, and it is possible to determine, by the contact angles, whether or not the units under test are defective. 
     Nowadays the way to measure the contact angles of the globules is to mount cameras at the sides of test stations so as to take pictures of the globules. Such measurement, however, has to take much more space, and so the cameras cannot be integrated into the probe card automatic test apparatus. Besides, such a way of measurement is defective as far as accuracy is concerned. 
     Given the above, with the spirit of aggressive innovation, an improved “Titration Module, Test Apparatus and Method for Measuring Titration Contact Angles” was conceived for solving the above-mentioned problems, and through persistent research and experiments, the present invention has eventually been accomplished. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to provide a titration module, comprising a base, at least one titration unit, a contact angle measuring module, and a computing unit. The at least one titration unit is disposed above the base for titrating a globule onto a device under test. The contact angle measurement module is disposed above the base for measuring a first height and a first radius of the globule. The first height relates to the maximum height of the globule in a longitudinal direction, and that the first radius relates to the radius of the maximum projected area of the globule in a longitudinal direction and the longitudinal direction is orthogonal to a contact surface between the globule and the device under test. The computing unit calculates a second radius according to the first height and the first radius. In addition, the computing unit calculates a contact angle of the globule according to the first height and the second radius. 
     Another object of the present invention is to provide a test apparatus, comprising a prober, a titration module, and a test head. The prober comprises a movable carrier and a probe card, where the movable carrier is provided for carrying a device under test and the probe card is located above the device under test. The titration module comprises a base, at least one titration unit, a contact angle measurement module, and a computing unit, where the at least one titration unit is disposed above the base for titrating a globule onto the device under test. The contact angle measurement module is disposed above the base, and is provided for measuring the first height and the first radius of the globule. The first height relates to the maximum height of the globule in a longitudinal direction, and that the first radius relates to the radius of the maximum projected area of the globule in a longitudinal direction and that the longitudinal direction is orthogonal to a contact surface between the globule and the device under test. The computing unit calculates a second radius according to the first height and the first radius, and that the computing unit calculates a contact angle of the globule according to the first height and the second radius. The test head comprises a test circuit board, where the test circuit board is electrically connected with the probe card. 
     Still another object of the present invention is to provide a method for measuring titration contact angles, where the method is performed by the titration module. The titration module comprises a base, at least one titration unit disposed above the base, and a contact angle measurement module and a computing device both disposed above disposed the base. The at least one titration unit is provided for titrating a globule onto a device under test. The contact angle measurement module comprises a height measurement laser module and a camera module. The method for measuring titration contact angles comprises the following steps: the height measurement laser module measures the first height above the globule; and the camera module measures the first radius above the globule, wherein the first height relates to the maximum height of the globule in a longitudinal direction, and the first radius relates to the radius of the maximum projected area of the globule in a longitudinal direction and the longitudinal direction is orthogonal to a contact surface between the globule and the device under test; and wherein the computing unit calculates a second radius according to the first height and the first radius, and the computing unit calculates a contact angle of the globule according to the first height and the second radius. 
     Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic diagram illustrating a test apparatus according to an embodiment of the present invention; 
         FIG. 2  is a schematic diagram illustrating a titration module according to an embodiment of the present invention; 
         FIG. 3(A)  is a schematic diagram illustrating a globule on a hydrophilic contact surface according to an embodiment of the present invention; 
         FIG. 3(B)  is a schematic diagram illustrating a contact angle of the globule on the hydrophilic contact surface as shown in  FIG. 3(A) ; 
         FIG. 3(C)  is a schematic diagram illustrating a globule on a hydrophobic contact surface according to an embodiment of the present invention; 
         FIG. 3(D)  is a schematic diagram illustrating a contact angle of the globule on the hydrophobic contact surface as shown in  FIG. 3(C) ; 
         FIG. 4  is a flowchart illustrating a method for measuring titration contact angles according to an embodiment of the present invention; 
         FIG. 5(A)  is a schematic diagram illustrating the measurement for a wafer according to a first embodiment of the present invention; 
         FIG. 5(B)  is a flowchart illustrating the wafer measurement according to the first embodiment of the present invention; 
         FIG. 6(A)  is a schematic diagram illustrating the measurement for a wafer according to a second embodiment of the present invention; 
         FIG. 6(B)  is a flowchart illustrating the wafer measurement according to the second embodiment of the present invention; 
         FIG. 7(A)  is a schematic diagram illustrating a process of the wafer measurement at a first measuring point according to the second embodiment of the present invention; and 
         FIG. 7(B)  is a schematic diagram illustrating a process of the wafer measurement at a second measuring point according to the second embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Different embodiments of the present invention are provided in the following description. These embodiments are meant to explain the technical content of the present invention, but not meant to limit the scope of the present invention. A feature described in an embodiment may be applied to other embodiments by suitable modification, substitution, combination, or separation. 
     The term “connected” as used herein refers to aspects such as direct connection or indirect connection, and is not limited thereto. The term “when . . . ” herein may denote “during the time that . . . ”, “before . . . ”, or “after . . . ” and is not limited thereto. 
     In the specification of the present invention, the ordinal numbers, such as “first” or “second”, are used to distinguish a plurality of elements having the same name, and it does not mean that there is essentially a level, a rank, an executing order, or an manufacturing order among the elements, except otherwise specified. 
       FIG. 1  is a schematic diagram illustrating a test apparatus  10  according to an embodiment of the present invention. The test apparatus  10  comprises a titration module  1 , a prober  11 , a camera monitor  15 , a laser rangefinder  16 , and a test head  13 . 
     According to the present invention, the titration module  1  is disposed above the prober  11 , and may be combined together with the prober  11 . The prober  11  comprises a movable carrier  12  and a probe card  21 , where the movable carrier  12  is provided for carrying a device under test  17  (for instance, a biochip, a wafer, and so forth, though not so limited), and the probe card  21  is located above the device under test  17 . As such, a tested position of the device under test  17  can be adjusted by the movable carrier  12 , so that the device under test  17  can be located corresponding to the titration module  1  on the prober  11  and the probe card  21  inside the prober  11 , and tests can be performed for test fluids and for electrical property. Further, the test head  13  comprises a test circuit board  14 , where the test circuit board  14  can be electrically connected with the probe card  21  through a signal wire  18  so as to transmit and calculate test signals instantly. This will achieve the purpose of test automatization, and to increase efficiency for tests. Besides, the camera monitor  15  and the laser rangefinder  16  can be employed to monitor and to align with a relative position and a relative distance between a tip portion  32  of the titration module  1  and the device under test  17 , so as to ensure that alignment between the titration module  1  and the device under test  17  is accurate. 
     Further, according to the present invention, the test apparatus  10  further comprises a clean device  19  for cleaning a surface of the device under test  17  after completion of the measurement. According to the present invention, the clean device  19  relates to, for instance, a suction device or a blower for cleaning surface of the device under test  17  after completion of the measurement, such as by way of air-suctioning or air-blowing, the test fluids on the device under test  17  can be removed. 
     Now a reference is made to  FIG. 2 , a schematic diagram illustrating the titration module  1  according to an embodiment of the present invention; and also to  FIG. 1 . 
     As shown in  FIG. 2 , the titration module  1  comprises a base  2 , at least one titration unit  30 , a contact angle measurement module  22 , and a computing unit  24 . In addition, according to the present invention, the titration module  1  further comprises a carrier unit  4  and a control unit  5 . 
     The at least one titration unit  30  is disposed above the base  2  for titrating a test fluid (globule  31 ) onto the to-be tested position of a contact surface  171  of the device under test  17  (as indicated on  FIG. 3(A)  and  FIG. 3(B) ), so as to proceed with a test (for instance a biochip test). The to-be tested position refers to a measuring point on a surface of a chip in a wafer (for instance the measuring point t 1 , t 2 , t 3 , or t 4  of  FIG. 5(A) ), so as to prevent the globule  31  from contacting the other portions of the wafer or the chip. The contact surface  171  of the device under test  17  relates to microporous material, such that in accordance with properties of the material, the globules  31  can be formed in various shapes. In an embodiment, the properties of the material of the contact surface are categorized into hydrophilic and hydrophobic. Accordingly, the characteristics of the globules  31  on different contact surfaces  171  are described as follows. 
     Further, references are made to  FIG. 3(A) , a schematic diagram illustrating a globule  31  on a hydrophilic contact surface  171 ;  FIG. 3(B) , a schematic diagram illustrating a contact angle of the globule  31  on the hydrophilic contact surface  171  as shown in  FIG. 3(A) ;  FIG. 3(C) , a schematic diagram illustrating a globule  31  on a hydrophobic contact surface  171 ; and  FIG. 3(D) , a schematic diagram illustrating a contact angle of the globule  31  on the hydrophobic contact surface  171  as shown in  FIG. 3(C) . Wherein, “areal” is defined as the maximum projected area of the globule  31  orthogonal to the contact surface  171  in a longitudinal direction (Z direction), and “area 2 ” relates to a contact area for the globule  31  to contact the contact surface  171 . A first height h 1  (considered as a real height of the globule  31 ) is defined as the maximum height for the globule  31  in a longitudinal direction (Z direction). A first radius r 1  is defined as the radius of the maximum projected area areal of the globule  31 . A second radius r 2  is defined as the radius of the contact area area 2  of the globule  31 . A radius r is defined as the radius of a whole sphere of the globule  31 . A contact angle θ is defined as the angle that the globule  31  contacts the contact surface  171 . 
     As shown in  FIG. 3(A)  and  FIG. 3(B) , the hydrophilic contact surface  171  has an adhesion with the liquid greater than the cohesion of the liquid itself, making the liquid form a smaller contact angle θ on the contact surface  171  (for instance smaller than or equal to 90 degrees, though not so limited). As such, when the globule  31  falls on the contact surface  171 , the globule  31  will diffuse on the contact surface  171  easily, and that the shape of the globule  31  will become half a sphere or smaller than half a sphere. Under such circumstances, the first height h 1  (the real height) of the globule  31  will be smaller than or equal to the first radius r 1 , as such, the first radius r 1  is equal to the second radius r 2 . It is therefore understood when the first height h 1  is smaller than or equal to the first radius r 1 , or when the contact angle θ is smaller than or equal to 90 degrees, the contact surface  171  can be determined as hydrophilic. 
     Now as shown in  FIG. 3(C)  and  FIG. 3(D) , the hydrophobic contact surface  171  has an adhesion with the liquid smaller than the cohesion of the liquid itself, making the liquid form a greater contact angle θ on the contact surface  171  (for instance greater than 90 degrees, though not so limited). As such, when the globule  31  falls on the contact surface  171 , the globule  31  may be difficult to diffuse on the contact surface  171 , and that the shape of the globule  31  may become slightly greater than half a sphere. Under such circumstances, the first radius r 1  of the globule  31  may be exactly the radius r of the whole sphere, that the first height h 1  is greater than the first radius r 1 , and that the second radius r 2  of the globule  31  can be defined as: 
         r 2=√{square root over (2 r 1 h 1− h 1 2 )}  (Formula 1);
 
     wherein r 1  is defined as the first radius, h 1  defined as the first height, and r 2  defined as the second radius. The maximum projected area, area  1 , for the globule  31  on the contact surface  171  is greater than the contact area area 2 , for the globule  31  on the contact surface  171 , and as such, the first height h 1  is greater than the first radius r 1 . It is understood, therefore, if the first height h 1  is greater than the first radius r 1 , or if the contact angle θ is greater than 90 degrees, the contact surface  171  can be determined as hydrophobic. Given the above, the characteristics of the globules  31  can be perceived. 
     Further, the components, other than the titration module  1 , are described as follows, together with references to  FIG. 2  to  FIG. 3(D) . 
     As shown in  FIG. 2 , the contact angle measuring module  22  is disposed above the base  2 , and is provided for measuring the first height h 1  and the first radius r 1  of the globule  31 . According to the present invention, the contact angle measuring module  22  comprises a height measurement laser module  221  and a camera module  222 , where the height measurement laser module  221  is provided for measuring the first height h 1  of the globule  31 , and the camera module  222  is for measuring the first radius r 1  of the globule  31 . 
     Further, as shown in  FIG. 2  to  FIG. 3(D) , the computing unit  24  can calculate the second radius r 2  according to the first height h 1  and the first radius r 1 . In addition, the computing unit  24  can calculate the contact angle θ of the globule  31  according to the first height h 1  and the second radius r 2 . According to the present invention, the computing unit  24  can calculate the contact angle θ by way of the following formula: 
     
       
         
           
             
               
                 
                   
                     θ 
                     = 
                     
                       
                         2 
                         ⁢ 
                         θ 
                         ⁢ 
                         1 
                       
                       = 
                       
                         2 
                         ⁢ 
                         
                           
                             tan 
                             
                               - 
                               1 
                             
                           
                           ⁡ 
                           
                             ( 
                             
                               
                                 h 
                                 ⁢ 
                                 
                                     
                                 
                                 ⁢ 
                                 1 
                               
                               
                                 r 
                                 ⁢ 
                                 
                                     
                                 
                                 ⁢ 
                                 2 
                               
                             
                             ) 
                           
                         
                       
                     
                   
                   ; 
                 
               
               
                 
                   ( 
                   
                     Formula 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     2 
                   
                   ) 
                 
               
             
           
         
       
     
     wherein θ is defined as the contact angle, and θ 1  is defined as half a contact angle. 
     In an embodiment, when the contact angle measurement module  22  measures the first height h 1  and the first radius r 1 , the computing unit  24  can compare the first height h 1  with the first radius r 1 , such that in case the first height h 1  is smaller than or equal to the first radius r 1 , the computing unit  24  can determine that the contact surface  171  is hydrophilic (for instance the contact angle θ is smaller than or equal to 90 degrees, though not so limited), and then sets the first radius r 1  as the second radius r 2 . When the first height h 1  is greater than the first radius r 1 , the computing unit  24  can determine that the contact surface  171  is hydrophobic (for instance the contact angle θ is greater than 90 degrees, though not so limited), and then by way of Formula 1, the second radius r 2  can be calculated. As such, the contact angle θ can be calculated accurately. 
     Further, in an embodiment, the at least one titration unit  30  can transmit information of the actual volume of a titrated globule  31  to the computing unit  24 , and the computing unit  24  can calculate a measured volume according to the first height h 1  and the second radius r 2 . Thereafter, the computing unit  24  can compare the actual volume and the measured volume, such that in case the difference between the actual volume and the measured volume exceeds a threshold difference value, the computing unit  24  will determine that the first height h 1  and the second radius r 2  are abnormal values, and then the computing unit  24  transmits information to the control unit  5  or the test apparatus  10 , so as to make the titration module  1  or the test apparatus  10  stop operation. In one embodiment, the threshold difference value is set to be ±15%, namely in case the actual volume is less or greater than the measured volume for 15%, the computing unit  24  will determine that the first height h 1  and the second radius r 2  are abnormal values, though not so limited. Still, in another embodiment, the threshold difference value is set to be ±10%, though not so limited. 
     In an embodiment, the measured volume can be defined as: 
     
       
         
           
             
               
                 
                   
                     v 
                     = 
                     
                       
                         
                           π 
                           ⁢ 
                           
                               
                           
                           ⁢ 
                           h 
                           ⁢ 
                           
                               
                           
                           ⁢ 
                           1 
                         
                         6 
                       
                       ⁢ 
                       
                         ( 
                         
                           
                             3 
                             ⁢ 
                             r 
                             ⁢ 
                             
                               2 
                               2 
                             
                           
                           + 
                           
                             h 
                             ⁢ 
                             
                               1 
                               2 
                             
                           
                         
                         ) 
                       
                     
                   
                   ; 
                 
               
               
                 
                   ( 
                   
                     Formula 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     3 
                   
                   ) 
                 
               
             
           
         
       
     
     wherein v is defined as the measured volume, and η is defined as the ratio of the circumference of a circle to its diameter 
     Still further, in an embodiment, the computing device  24  relates to a computer program product or a firmware, and can be stored in a non-transitory computer-readable medium, which can be run by a processor or the control unit  5  in the titration module  1 ; or alternatively, which can be installed in an electronic device outside of the titration module  1  (for instance an external computer), though not so limited. 
     According to the present invention, as shown in  FIG. 1  and  FIG. 2 , the carrier unit  4  is connected with the at least one titration unit  30  and the contact angle measurement module  22 , and comprises driving devices  41 ,  42 ,  43  for performing multi-axial motions, so as to move selectively the at least one titration unit  30  and the contact angle measurement module  22 , and to adjust the titration positions. In other words, the carrier unit  4  can move the at least one titration unit  30  to a place above the movable carrier  12  (see  FIG. 1 ) so as to align the at least one titration unit  30  with the device under test  17 . The control unit  5  is electrically connected with the carrier unit  4  so as to control the driving devices  41 ,  42 ,  43 . Since the structure and the operational manner of the carrier unit  4  and of the control unit  5  are not significant to the present invention, no further detailed description therefor is necessary. 
     Further, in an embodiment, when the globule  31  falls on the device under test  17 , the carrier unit  4  moves, respectively, the height measurement laser module  221  and the camera module  222  to a place above the globule  31  (the sequence of movement is not specifically limited), such that the height measurement laser module  221  can measure the first height h 1  from above the globule  31 , and that the camera module  222  measure the first radius r 1  from above the globule  31 . In an embodiment, the so-called “above” can be defined as “right above” of the globule  31 ; or on the other hand, the so-called “above” can be defined as a range 45 degrees clockwise or counterclockwise from the axis of the globule  31  center extending and perpendicular to the contact surface  171 , though not so limited. 
     Still further, in an embodiment, both the height measurement laser module  221  and the camera module  222  are arranged above the movable carrier  12  near the at least one titration unit  30 , without the necessity of arranging beside the prober  11 . As such, the titration module  1  can be integrated with the existing probe card device. 
     As those skilled in the art may know that the titration module  1  can comprise more other components. However, since these components are not significant to the present invention, and since they are well known to those skilled in the art, no further detailed descriptions thereto are necessary. 
     According to the present invention, a method for measuring titration contact angles involves the process of operation for the contact angle measurement module  22  and for the computing unit  24 , where the method is performed by the titration module  1 . Now references are made to  FIG. 1  to  FIG. 4 , wherein  FIG. 4  is a flowchart illustrating a method for measuring titration contact angles according to an embodiment of the present invention. 
     As shown in  FIG. 4 , step S 41  is performed first, namely, the height measurement laser module  221  measures the first height h 1  of the globule  31  from above the globule  31 ; and the camera module  222  measures the first radius r 1  of the globule  31  from above the globule  31 . Thereafter, step S 42  is performed, namely, the computing unit  24  compares the first height h 1  with the first radius r 1  so as to determine whether the first height h 1  is greater than the first radius r 1 . In case the first height h 1  is not greater than the first radius r 1  (that is to say, the first height h 1  is smaller than or equal to the first radius r 1 ), then step S 43  is performed, the computing unit  24  sets the first radius r 1  as the second radius r 2 , and that calculates the contact angle θ of the globule  31  (Formula 2) according to the first height h 1  and the second radius r 2 . However, in case the first height h 1  is greater than the first radius r 1 , then step S 44  is performed, such that the computing unit  24  calculates the second radius r 2  according to the first height h 1  and the first radius r 1  (Formula 1), and calculates the contact angle θ of the globule  31  according to the first height h 1  and the second radius r 2  (Formula 2). As such, the method for measuring titration contact angles, according to the present invention, is completed, and that the contact angle θ of the globule  31  formed on the device under test  17  can be obtained. 
     Further, in applying the method for measuring titration contact angles to measure a wafer, there will be several embodiments available in accordance with the situations of measurement. First, the situation of measurement for a single wafer is described, together with references made to  FIG. 1  to  FIG. 5(B) , wherein  FIG. 5(A)  is a schematic diagram illustrating the measurement for a wafer according to a first embodiment of the present invention; and  FIG. 5(B)  is a flowchart illustrating the wafer measurement according to the first embodiment of the present invention; and wherein  FIG. 5(A)  illustrates a top view of the wafer (for instance, viewed in a direction opposed to Z direction). 
     As shown in  FIG. 5(A) , the device under test  17  relates to a wafer having a single chip, wherein the chip comprises a plurality of measuring points, and for convenience, explanation is given with four measuring points t 1  to t 4  as an example. 
     In an embodiment, the information about positions of the measuring points t 1  to t 4  are preset in probing configuration files (for instance, a first probing configuration file, file 1  to a fourth probing configuration file file 4 ). The control unit  5  can read the probing configuration files, file 1  to file 4 , and control the carrier unit  4 , so as to move the titration module  1  to where above the measuring points t 1  to t 4 , though not so limited. 
     As shown in  FIG. 5(B) , first, step S 51  is performed, namely, when the wafer (the device under test  17 ) is placed on a carrier, the control unit  5  reads the first probing configuration file file 1  corresponding to the measuring point t 1 . Thereafter, step S 52  is performed, namely, the titration module  1  is moved to above the measuring point t 1  (i.e. a first test position). Then step S 53  is performed, namely, the at least one titration unit  30  titrates a globule  31  to the measuring point t 1 . Thereafter, step S 54  is performed, namely, the height measurement laser module  221  measures the first height h 1  of the globule  31  and that the camera module  222  measures the first radius r 1  of the globule  31 . Then step S 55  ( a ) is performed, namely, the computing unit  24  obtains the first height h 1  and the first radius r 1 . And then step S 55  ( b ) is performed, namely, the computing unit  24  calculates the contact angle θ of the globule  31 . Thereafter, step S 56  is performed, namely, the clean device  19  removes the globule  31  from the measuring point t 1 . Then step S 57  is performed, repeating steps S 51  to S 56  until the measurements performed from the measuring point t 2  (ie. a second test position) to the measuring point t 4  (i.e. a fourth test position) are completed. As such, a method for measuring titration contact angles applying to the wafer measurement process according to the first embodiment of the present invention can be accomplished. 
     Further, in an embodiment, after step S 53  has been performed (i.e. the at least one titration unit  30  has titrated the globule  31  on the measuring point t 1 ), a step S 53 ′ can be performed, namely, the at least one titration unit  30  transmits information about an actual volume of the globule  31  to the computing unit  24 . After step S 55 ( a ) has been performed (the computing unit  24  acquires the first height h 1  and the first radius r 1 ), step S 55 ( a )′ can be then be performed, where the computing unit  24  calculates the second radius r 2  according to the first height h 1  and the first radius r 1 , and calculates the measured volume of the globule  31  according to the first height h 1  and the second radius r 2 , for instance as calculated in accordance with Formula 3. Thereafter, step S 55 ( b )′ is performed, namely, the computing unit  24  compares whether the difference between the actual volume and the measured volume of the globule  31  exceeds the threshold difference value (for instance the difference exceeds ±15%). In case the difference between the actual volume and the measured volume of the globule  31  exceeds the threshold difference value, step  55 ( c )′ is performed, and that the titration module  1  or the test apparatus  10  stops working. However, if the difference between the actual volume and the measured volume of the globule  31  does not exceed the threshold difference value (comprising if the difference is within ±15% or if the difference is exactly +15% or −15%), step  55 ( c )′, then the titration module  1  or the test apparatus  10  continues to work, for instance, performing step S 55 ( b ), though not so limited. As such, the measurement data being used for the computing unit  24  can assure accuracy. 
     It should be noted that so long as feasibility of implementation exists, the aforementioned steps can be modified or changed. 
     Still further, in applying the method for measuring titration contact angles to measure a wafer, a second embodiment therefor is described as follows with references to  FIG. 1  to  FIG. 6(B) , wherein  FIG. 6(A)  is a schematic diagram illustrating the measurement for a wafer according to the second embodiment of the present invention, and  FIG. 6(B)  is a flowchart illustrating the wafer measurement according to the second embodiment of the present invention. In the second embodiment, the measurement for a wafer having a plurality of chips is described. 
     As shown in  FIG. 6(A) , exemplification is given for the measurement of a wafer having four chips  1710 - 1740 , wherein each of the four chips  1710 - 1740  has four measuring points t 1  to t 4 . In an embodiment, the location information of the chips  1710 - 1740  and the measuring points t 1  to t 4  are preset in the probing configuration files file 1  to file 4 . The control unit  5  can read the probing configuration files file 1  to file 4 , and control the carrier unit  4 , so as to move the titration module  1  to where above the measuring points t 1  to t 4  of the target chips  1710 - 1740 . In an embodiment, the process of measurement is set as when all the measuring points t 1  of the chips  1710 - 1740  of the wafer (i.e. the first test positions) have completed measurement, all the measuring points t 2  (i.e. the second test positions) can then be proceeded with measurement, though not so limited. 
     Further, as shown in  6 (B), first, step S 61  is performed, namely, when the chips are placed on the carrier, the control unit  5  reads the first probing configuration file file 1 , so as to acquire the location data of all chips  1710 - 1740  on the wafer and the location data of the measuring points t 1  of all the chips  1710 - 1740 . Thereafter, step S 62  is performed, namely, the titration module  1  is moved to above the measuring point t 1  of the chip  1710 . Then step S 63  is performed, namely, the at least one titration unit  30  titrates a globule  31  to the measuring point t 1  of the chip  1710 . Thereafter, step S 64  is performed, namely, the height measurement laser module  221  measures the first height h 1  of the globule  31  and that the camera module  222  measures the first radius r 1  of the globule  31 . Then step S 65  is performed, namely, the computing unit  24  obtains the first height h 1  and the first radius r 1 , and calculates the contact angle θ of the globule  31 . Thereafter, step S 66  is performed, namely, the clean device  19  removes the globule  31  from the measuring point t 1 . Then step S 67  is performed, repeating steps S 61  to S 66  until the measurements performed on the measuring points t 1  of all the chips  1710 - 1740  are completed. Thereafter, step S 68  is performed, namely, the control unit  5  reads the second probing configuration file, file  2 , so as to acquire the location data of all the chips  1710 - 1740  and the location data of the measuring points t 2  of all the chips  1710 - 1740 . Then step S 69  is performed, repeating steps S 61  to S 68  until the measurements performed on the measuring points t 1  to t 4  of all the chips  1710 - 1740  are completed. 
     Still further, references are made to  FIG. 7(A) , a schematic diagram illustrating a process of the wafer measurement (applying the method for measuring titration contact angles to measure a wafer having multiple chips) at the first measuring point t 1  according to the second embodiment of the present invention; and  FIG. 7(B) , a schematic diagram illustrating a process of the wafer measurement (applying the method for measuring titration contact angles to measure a wafer having multiple chips) at the second measuring point t 2  according to the second embodiment of the present invention. In the second embodiment, when the method for measuring titration contact angles is applied in the measurement process of wafers with multiple chips, the probing configuration files file 1  to file 4 , are each able to record specific measuring positions of the chips  1710 - 1740 , so as to drive and control the titration module  1 , and to complete, in sequence, the work of measurement at the specific measuring points t 1 -t 4  of each chip  1710 - 1740 . In other words, the control unit  5  sets the data of specific coordinates of the measuring points t 1  to t 4  for each of the chips  1710 - 1740  by way of the probing configuration files file 1  to file 4 . As such, the titration module  1  can move, respectively, to the same measuring points of the chips  1710 - 1740 , so as to complete, in sequence, the work of measurement. As shown in  FIG. 7(A) , by way of the first probing configuration file file 1 , the measuring points t 1  in the chips  1710 - 1740  for the titration module  1  can be controlled in sequence, namely, the titration module  1  can move with spacing LX 1  and spacing LY 1  on the X axis and the Y axis, respectively, so as to perform the work of titration at positions of the measuring points t 1  for the chips  1710 - 1740 . Further, as shown in  FIG. 7(B) , by way of the second probing configuration file file 2 , the measuring points t 2  in the chips  1710 - 1740  for the titration module  1  can be controlled in sequence, namely, the titration module  1  can move with spacing LX 2  and spacing LY 2  on the X axis and the Y axis, respectively, so as to perform the work of titration at positions of the measuring points t 2  for the chips  1710 - 1740 . Similarly, for the work of titration at positions of the measuring points t 3 , t 4  of the other chips  1710 - 1740 , descriptions for the measurement given to the measuring points t 1  and t 2  also apply to those for the measuring points t 3  and t 4 , and thus no repetition of description is necessary. 
     According to the present invention, upon performing an electric test, given that a probe card device (for instance but not limited to the prober  11  having a probe card  21  as shown in  FIG. 1 ) is provided with multiple probes, the probe card device can through the probing configuration files, allow multiple probes to touch multiple pads on a single chip for performing the electric test, namely, the multiple probes need only to stay once on each individual chip. However, upon performing the titration test, the titration module  1  may be only arranged with one single titration unit  30 . In view of the fact that the titration unit  30  may only titrate one test fluid on a specific measuring point (for instance t 1 ), rather than being able to titrate test fluids, in the meantime, on multiple measuring points (for instance t 1  to t 4 ) on the single chip. As such, when the titration module  1  employs a single probing configuration file (for instance file 1 ) of the probe card device, the titration module  1  can only move, in sequence, equidistantly to the same measuring point (for instance t 1 ) of each chip (for instance  1710 - 1740 ), rather than make the titration module  1  titrate in the meantime completely for the titration measuring points (for instance t 1  to t 4 ). Therefore, by way of the method for measuring titration contact angles, according to the second embodiment, the titration module  1  employs multiple probing configuration files (for instance file 1  to file 4 ) for performing the titration work at the measuring points (for instance t 1  to t 4 ) for all the chips (for instance  1710 - 1740 ). This makes it possible that the titration module  1  can be integrated into the present probe card device. 
     Given the above, it is understood that the present invention provides a measuring device, a titration module, and a measuring method, having merits in the measurement of titration contact angles. Namely, not only the volume of the overall apparatus can be reduced, but also the purpose of accurate measurement can be achieved. 
     Although the present invention has been explained in relation to its preferred embodiments, it is to be understood that many other possible modifications and variations can be made without departing from the scope of the invention as hereinafter claimed.