Abstract:
A gas sensing system includes an air intake hole which comprises a plurality of micro-flow channels, a replaceable sensor for receiving an air from the air intake hole and detecting the received air, and a processing unit coupled to the replaceable sensor and doing determination for the component of the air according to a detection result of the replaceable sensor. Wherein, the replaceable sensor includes a plurality of sensing chips arranged in an array and each sensing chip is coated with a sensing thin film separately to detect a different gas.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a gas sensing system, and more particularly to a replaceable gas sensing system which can be applied according to the different applications. 
         [0003]    2. Description of Related Art 
         [0004]    The gas sensing device can provide a standard for the gas to replace the uncertainty by human such that it is widely used in the energy, industry, agriculture, transportation, science, national defense, environmental protection and other fields. Although the gas sensing device has many applications, most of the gas sensing device is limited by the expensive prices and the inconvenience of carrying so that it cannot be applied popularly. 
         [0005]    The design of the current gas sensing device is a customized design device in its algorithm and sensing chip for the gas waited to be detected. Therefore, the device and the algorithms can only detect specific gases, and they cannot widely detect a variety of gases at the same time. 
         [0006]    Furthermore, in the actual environment, a gas will not exist alone, and it will mix with a variety of other gases. Therefore, the current gas sensing device has a high possibility of misjudgment, and its reliability is very low when the gas sensing device is detecting a gas. 
       SUMMARY OF THE INVENTION 
       [0007]    The main object of the present invention is to provide a gas sensing system includes an air intake hole which comprises a plurality of micro-flow channels, a replaceable sensor for receiving an air from the air intake hole and detecting the received air, and a processing unit coupled to the replaceable sensor and doing determination for the component of the air according to a detection result of the replaceable sensor. Wherein, the replaceable sensor includes a plurality of sensing chips arranged in an array and each sensing chip is coated with a sensing thin film separately to detect a different gas. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0008]      FIG. 1  is a schematic diagram of a gas sensing device which can combine with a mobile device according to an embodiment of the present invention. 
           [0009]      FIG. 2  is a schematic diagram of sensor array according to an embodiment of the present invention. 
           [0010]      FIG. 3  is a schematic diagram of a gas sensing system having the gas sensing device shown in  FIG. 1  according to an embodiment of the present invention. 
           [0011]      FIG. 4  is a schematic diagram of a gas sensing system having the gas sensing device shown in  FIG. 1  according to another embodiment of the present invention. 
           [0012]      FIG. 5  is a schematic diagram of a gas sensing system having the gas sensing device shown in  FIG. 1  according to another embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0013]    The following content combines with the drawings and the embodiment for describing the present invention in detail. 
         [0014]    As shown in  FIG. 1 , it is a schematic diagram of a gas sensing device  10  which can combine with a mobile device according to an embodiment of the present invention. The gas sensing device  10  includes an air intake hole  12 , a sensor array  14 , and a data output connector  16 . In one embodiment, the sensor array  14  includes a plurality of sensor modules  14 - 1 ˜ 14 -N, wherein, a surface of each sensor module coats with a different sensing material according to the type of the gas to be detected. For example, a resistive sensing film composed of a polymer and a conductive carbon material. However, the present invention is not limited thereto. Each sensor module can be replaced respectively according to different applications. 
         [0015]    In one embodiment, the surfaces of the sensor modules  14 - 1 ˜ 14 -N covered with polymer material having a height (for example, a photoresist hiving a thickness of 50 um). As shown in  FIG. 2 , it is a schematic diagram of the sensor array  14  according to an embodiment of the present invention. From  FIG. 2 , the present invention coats with different materials at different electrode areas such that the sensor array  14  can distinguish different gases at the same time. The coating method may comprise inkjet, nano jet, screen printing, micro-contact printing, and pulsed laser vacuum deposition, etc. to form the sensor modules  14 - 1 ˜ 14 -N arranged in an array. Through the method of coating different materials at different electrode areas, the sensor array  14  capture data of a set of gases which comprises many gas combinations, not just data of single gas. 
         [0016]    In one embodiment, the sensor array  14  is installed in the gas sensing device  10  by a type of solid-state memory card (e.g., Micro Secure Digital Card Micro SD) and achieves a replaceable function by combining with a corresponding socket. 
         [0017]    In another embodiment, the air intake hole  12  of the gas sensing device  10  includes a plurality of micro-flow channels (not shown) to increase the sensitivity of the gas sensing device  10 . The plurality of micro-flow channels are connected to a micro-cavity (not shown), wherein, the micro-cavity has a volume capacity and range such that the air can remain or mix. In one embodiment, the micro-cavity is a closed or open micro-cavity. In one embodiment, the closed micro-cavity has an exhaust device (not shown). 
         [0018]      FIG. 3  shows a schematic diagram of a gas sensing system  18  having the gas sensing device  10  shown in  FIG. 1  according to an embodiment of the present invention.  FIG. 3  will combine  FIG. 1  for illustrating. As shown in  FIG. 3 , the gas sensing system  18  includes the gas sensing device  10 , a processing unit  13 , a memory unit  15 , and a display unit  17 . In one embodiment, the gas sensing system  18  utilizes the air intake hole  12  of the gas sensing device  10  to receive a gas, and utilizes the sensor array  14  to detect the data of the gas (e.g., the type or concentration of the gas etc.). Then, the gas sensing system  18  transmit the relative data of the gas to the processing unit  13 . After the processing unit  13  receives the data of the gas, the processing unit  13  displays an analysis result to the display unit  17  for user to do determination through handing and comparing the data of the gas with the preset data stored in the memory unit  15  (for example, a database). In this embodiment, the gas sensing system  18  is a stand-alone operation type. Therefore, it can omit the data output connector of the gas sensing device  10 . 
         [0019]      FIG. 4  shows a schematic diagram of a gas sensing system  20  having the gas sensing device  10  shown in  FIG. 1  according to another embodiment of the present invention.  FIG. 4  will combine  FIG. 1  for illustrating. 
         [0020]    The gas sensing system  20  includes a gas sensing device  10  and a mobile device  22 . In one embodiment, the gas sensing device  10  communicates with the mobile devices  22  (e.g., smart phone, tablet PC, or laptops, etc.) through a data output connector  16  (e.g., USB). The gas sensing device  10  transmits the gas data detected by it to the mobile device  22 . It utilizes a processing unit  26  to cooperate with a database  24  for comparing, analyzing and processing the gas data. 
         [0021]      FIG. 5  shows a schematic diagram of a gas sensing system  30  having the gas sensing device  10  shown in  FIG. 1  according to another embodiment of the present invention.  FIG. 5  will combine  FIG. 1  for illustrating. 
         [0022]    The gas sensing system  30  includes a gas sensing device  10 , a mobile device  32 , and a database  34 . In one embodiment, the gas sensing device  10  communicates with the mobile device  32  (e.g., smart phone, tablet PC, or laptops, etc.) through the data output connector  16  (e.g., USB). The gas sensing device  10  transmits the gas data detected by it to the mobile device  32 . In one embodiment, the mobile device  32  can utilize its communication function to download the data located at a cloud database  34  such that it compares, analyzes and processes the gas data inside the mobile device  32 . Finally, the mobile device  32  utilizes its communication function (for example, Bluetooth or RF) to output the detected data. 
         [0023]    In another embodiment, the mobile device  32  may also utilize its wireless transmission function to upload the gas data to the cloud database  34 , and the gas data is compared, analyzed and processed in the cloud. 
         [0024]    The present invention provides a replaceable gas sensing device and a system using the same. It utilizes the sensors to arrange in an array to forma gas sensing device capable of detecting a variety of gases at the same time, and then it utilizes a particular database and the algorithm to determine the received mixed gases. 
         [0025]    Wherein, the sensor array of the sensing device is replaceable, and it can dispose different sensor arrays according to different applications. The reason why the sensor array can detect a variety of gases is that each sensor is coated with a different material. Therefore, each sensor can sense a different gas. The present invention can solve the traditional gas sensing device which can only detect one kind of gas, and also improve the drawback of the high error and low reliability. 
         [0026]    The above embodiments of the present invention are not used to limit the claims of this invention. Any use of the content in the specification or in the drawings of the present invention which produces equivalent structures or equivalent processes, or directly or indirectly used in other related technical fields is still covered by the claims in the present invention.