Specific device, specific method, and program

Abstract

To determine the amount of displacement of a vehicle's body frame using optical fiber sensing. [Solution] The identification device according to the present disclosure comprises: communication means for receiving backscattered light from an optical fiber installed in a vehicle; detection means for detecting the magnitude of strain generated at each position on the optical fiber using the backscattered light; and identification means for maintaining a correspondence table that associates positions on the optical fiber with positions on the vehicle body frame, and for identifying the amount of displacement at each position on the vehicle body frame using the magnitude of strain at each position on the optical fiber and the correspondence table.

Description

Technical Field

[0001] The present disclosure relates to a specific device, a specific method, and a program.

Background Art

[0002] In recent years, a technology called fiber optic sensing that uses an optical fiber as a sensor has attracted attention. In fiber optic sensing, it is possible to sense vibrations, sounds, temperatures, etc. generated around the optical fiber.

[0003] Also, recently, technologies using fiber optic sensing have been proposed. For example, Patent Document 1 discloses a technology that applies fiber optic sensing to a vehicle and senses abnormal vibrations inside the vehicle by fiber optic sensing.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The technology disclosed in Patent Document 1 is a technology that senses abnormal vibrations inside a vehicle by fiber optic sensing. Therefore, in the future, it is expected that the demand for technologies that apply fiber optic sensing to vehicles, such as the technology disclosed in Patent Document 1, will increase. As an example, for instance, if it is possible to specify the displacement amount of the vehicle body frame of a vehicle using fiber optic sensing, it is considered convenient.

[0006] Therefore, an object of the present disclosure is to provide a specific device, a specific method, and a program capable of specifying the displacement amount of a vehicle body frame of a vehicle using fiber optic sensing in view of the above-described problems. [Means for solving the problem]

[0007] A specific device according to one embodiment is: A communication means for receiving backscattered light from an optical fiber installed in a vehicle, A detection means for detecting the magnitude of strain generated at each position on the optical fiber using the backscattered light, The system includes a correspondence table that associates positions on the optical fiber with positions on the vehicle's body frame, and a determination means that uses the magnitude of the distortion at each position on the optical fiber and the correspondence table to determine the amount of displacement at each position on the vehicle's body frame.

[0008] One method of identification is: A specific method performed by a specific device, A receiving step in which backscattered light is received from an optical fiber installed in the vehicle, A detection step in which the magnitude of distortion generated at each position on the optical fiber is detected using the backscattered light, The method includes a step of maintaining a correspondence table that associates positions on the optical fiber with positions on the vehicle's body frame, and using the magnitude of the distortion at each position on the optical fiber and the correspondence table to determine the amount of displacement at each position on the vehicle's body frame.

[0009] A program according to one aspect is: On the computer, A receiving procedure for receiving backscattered light from an optical fiber installed in a vehicle, A detection procedure for detecting the magnitude of distortion generated at each position on the optical fiber using the backscattered light, The system maintains a correspondence table that associates positions on the optical fiber with positions on the vehicle's body frame, and performs a procedure to identify the amount of displacement at each position on the vehicle's body frame using the magnitude of the distortion at each position on the optical fiber and the correspondence table. [Effects of the Invention]

[0010] According to the above-described aspect, an effect can be obtained that a specifying device, a specifying method, and a program capable of specifying the displacement amount of a vehicle body frame using optical fiber sensing can be provided.

Brief Description of the Drawings

[0011] [Figure 1] It is a diagram for explaining an installation example of an optical fiber in a vehicle according to the present disclosure. [Figure 2] It is a block diagram showing a configuration example of a specifying device according to the present disclosure. [Figure 3] It is a diagram for explaining an example of a correspondence table held by a specifying unit according to the present disclosure. [Figure 4] It is a flowchart for explaining an example of the operation flow of a specifying device according to the present disclosure. [Figure 5] It is a block diagram showing a configuration example of a specifying device according to the present disclosure. [Figure 6] It is a flowchart for explaining an example of the operation flow of a specifying device according to the present disclosure. [Figure 7] It is a block diagram showing a configuration example of a specifying device according to the present disclosure. [Figure 8] It is a flowchart for explaining an example of the operation flow of a specifying device according to the present disclosure. [Figure 9] It is a block diagram showing a configuration example of a specifying device according to the present disclosure. [Figure 10] It is a diagram for explaining an example of a screen generated by a display control unit according to the present disclosure. [Figure 11] It is a flowchart for explaining an example of the operation flow of a specifying device according to the present disclosure. [Figure 12] It is a block diagram showing a hardware configuration example of a computer that realizes a specifying device according to the present disclosure.

Embodiments for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. For the sake of clarity of explanation, the following description and drawings are appropriately omitted and simplified. Also, in each of the following drawings, the same elements are denoted by the same reference numerals, and redundant explanations are omitted as necessary. Further, the specific numerical values shown below are merely examples for facilitating the understanding of the present disclosure and are not limited thereto.

[0013] <Embodiment 1> First, an installation example of the optical fiber 20 in the vehicle 30 according to the present disclosure will be described. FIG. 1 is a diagram for explaining an installation example of the optical fiber 20 in the vehicle 30 according to the present disclosure.

[0014] As shown in FIG. 1, the optical fiber 20 is installed inside the vehicle body frame 31 of the vehicle 30. Specifically, the optical fiber 20 is installed so as to be close to or in close contact with the inside of the vehicle body frame 31. Also, one end of the optical fiber 20 is connected to a specific device 10 according to the present disclosure described later. The specific device 10 specifies the displacement amount at each position of the vehicle body frame 31 by performing optical fiber sensing using the optical fiber 20 as described later.

[0015] In FIG. 1, the arrow FR indicates the front side in the vehicle longitudinal direction, and the arrow LH indicates the left side in the vehicle width direction. Also, the position where the specific device 10 in the vehicle 30 is arranged is an example and is not limited to the position shown in FIG. 1. Also, positions P1, etc. will be described later.

[0016] Next, the configuration of the specific device 10 according to the present disclosure will be described. FIG. 2 is a block diagram showing a configuration example of the specific device 10 according to the present disclosure. As shown in FIG. 2, the specific device 10 includes a communication unit 11, a detection unit 12, and a specification unit 13. Note that the specific device 10 performs DSS (Distributed Strain Sensing) for detecting the strain generated at each position on the optical fiber 20 as optical fiber sensing.

[0017] The communication unit 11 transmits pulsed light to the optical fiber 20. As the pulsed light is transmitted through the optical fiber 20, backscattered light is generated in the optical fiber 20, and the communication unit 11 receives this backscattered light.

[0018] When distortion occurs in the optical fiber 20, the characteristics (e.g., wavelength) of the backscattered light transmitted through the optical fiber 20 change. Therefore, the detection unit 12 can detect the distortion generated in the optical fiber 20 based on the backscattered light received by the communication unit 11. Furthermore, the detection unit 12 can calculate the magnitude of the distortion based on the degree of change in the characteristics of the backscattered light.

[0019] Furthermore, the detection unit 12 can determine the position on the optical fiber 20 (distance from the specific device 10) of the point where the backscattered light was generated, based on the time difference between the time when the pulse light was transmitted by the communication unit 11 and the time when the backscattered light was received by the communication unit 11.

[0020] Therefore, the detection unit 12 can use the backscattered light received from the optical fiber 20 by the communication unit 11 to detect the magnitude of the distortion generated at each position on the optical fiber 20.

[0021] The identification unit 13 holds a correspondence table in which the position on the optical fiber 20 (distance from the identification device 10) is associated with the position of the vehicle body frame 31 of the vehicle 30. Figure 3 is a diagram illustrating an example of a correspondence table maintained by the specific unit 13 relating to this disclosure.

[0022] As shown in Figure 3, for example, the distance d1 [m] from the specific device 10 is associated with the position P1 of the vehicle body frame 31 of the vehicle 30 (see Figure 1). Therefore, by using a correspondence table, the specific unit 13 can determine that the strain generated at a distance d1 [m] from the specific device 10 is the strain generated at position P1 of the vehicle body frame 31.

[0023] Furthermore, the specific unit 13 can determine the magnitude of the distortion that occurred at position P1 of the vehicle frame 31 by using the detection result from the detection unit 12. Therefore, the specific unit 13 can determine the amount of displacement at position P1 by using the magnitude of the strain generated at position P1 of the vehicle body frame 31.

[0024] Here, it is assumed that the greater the displacement of position P1, the greater the magnitude of the strain generated at position P1. Therefore, for example, the specific part 13 identifies that the greater the magnitude of the strain generated at position P1, the greater the displacement of position P1. The displacement of position P1 is the displacement from the initial position of position P1. The initial position of position P1 can be confirmed, for example, from the design drawings of the vehicle 30.

[0025] Therefore, the identification unit 13 can determine the amount of displacement at each position of the vehicle body frame 31 using the magnitude of the distortion at each position on the optical fiber 20 detected by the detection unit 12 and the corresponding table.

[0026] Next, we will explain the operation flow of the specific device 10 related to this disclosure. Figure 4 is a flowchart illustrating an example of the operation flow of the specific device 10 according to this disclosure. Here, it is assumed that the specific unit 13 already holds a correspondence table as shown in Figure 3.

[0027] As shown in Figure 4, first, the communication unit 11 transmits pulsed light to the optical fiber 20 installed in the vehicle 30 and receives backscattered light from the optical fiber 20 (step S11).

[0028] Next, the detection unit 12 uses the backscattered light received from the optical fiber 20 by the communication unit 11 to detect the magnitude of the distortion generated at each position on the optical fiber 20 (step S12).

[0029] Subsequently, the identification unit 13 uses the magnitude of the strain at each position on the optical fiber 20 detected by the detection unit 12 and the corresponding table to determine the amount of displacement at each position of the vehicle body frame 31 (step S13).

[0030] As described above, according to this embodiment 1, the communication unit 11 receives backscattered light from the optical fiber 20 installed in the vehicle 30. The detection unit 12 uses the backscattered light to detect the magnitude of the strain generated at each position on the optical fiber 20. The identification unit 13 uses the magnitude of the strain at each position on the optical fiber 20 and a corresponding table to identify the amount of displacement at each position of the vehicle body frame 31 of the vehicle 30. This makes it possible to identify the amount of displacement of the vehicle body frame 31 of the vehicle 30 using optical fiber sensing.

[0031] <Embodiment 2> First, the configuration of the specific device 10A related to this disclosure will be explained. Figure 5 is a block diagram showing an example configuration of the specific device 10A related to this disclosure. As shown in Figure 5, the specific device 10A differs from the specific device 10 shown in Figure 2 in that the detection unit 12 and the specific unit 13 are replaced with detection unit 12A and the specific unit 13A. In addition to performing the DSS described above as optical fiber sensing, the specific device 10A also performs DAS (Distributed Acoustic Sensing), which detects vibrations and sounds generated at various locations on the optical fiber 20. Furthermore, the specific device 10A is positioned in the same location as the specific device 10 in Figure 1, for example, but is not limited to this.

[0032] When vibration occurs in the optical fiber 20, the characteristics (e.g., wavelength) of the backscattered light transmitted through the optical fiber 20 change. Therefore, the detection unit 12A can detect vibrations occurring in the optical fiber 20 based on the backscattered light received by the communication unit 11. Furthermore, the detection unit 12A can calculate the vibration intensity based on the degree of change in the characteristics of the backscattered light.

[0033] Therefore, the detection unit 12A can use the backscattered light received from the optical fiber 20 by the communication unit 11 to detect the vibration intensity of vibrations generated at each position on the optical fiber 20. Furthermore, the detection unit 12A, similar to the detection unit 12 shown in Figure 2, detects the magnitude of the strain generated at each position on the optical fiber 20.

[0034] The specific unit 13A, like the specific unit 13 shown in Figure 2, maintains a correspondence table as shown in Figure 3. Therefore, the identification unit 13A can determine the magnitude of strain and vibration intensity at each position on the optical fiber 20 detected by the detection unit 12A, using a corresponding table. Furthermore, the identification unit 13A can determine the amount of displacement at each position of the vehicle frame 31 using the magnitude of strain and vibration intensity at each position of the vehicle frame 31.

[0035] Here, it is thought that the greater the displacement at a certain position, the greater the magnitude of the strain generated at that position. Also, it is thought that the greater the displacement at a certain position, the greater the vibration intensity of the vibration generated at that position.

[0036] For example, the specific unit 13A identifies that the greater the magnitude of the strain generated at a certain position, the greater the displacement at that position. Furthermore, the specific unit 13A identifies that the greater the vibration intensity of the vibration generated at a certain position, the greater the displacement at that position. In this way, by using both the magnitude of the strain and the vibration intensity at each position of the vehicle frame 31 to identify the displacement at each position of the vehicle frame 31, it becomes possible to improve the accuracy of displacement identification.

[0037] Next, we will explain the operation flow of the specific device 10A related to this disclosure. Figure 6 is a flowchart illustrating an example of the operation flow of the specific device 10A according to this disclosure. Here, it is assumed that the specific unit 13A already holds a correspondence table as shown in Figure 3.

[0038] As shown in Figure 6, first, the same processes as steps S11 and S12 shown in Figure 4, steps S21 and S22, are performed. Next, the detection unit 12A uses the backscattered light received from the optical fiber 20 by the communication unit 11 to detect the vibration intensity of vibrations generated at each position on the optical fiber 20 (step S23).

[0039] Subsequently, the identification unit 13A uses the magnitude of strain and vibration intensity at each position on the optical fiber 20 detected by the detection unit 12A and a corresponding table to determine the amount of displacement at each position of the vehicle body frame 31 (step S24).

[0040] As described above, according to this second embodiment, the detection unit 12A uses backscattered light to detect the magnitude of strain and vibration intensity at each position on the optical fiber 20. The identification unit 13A uses the magnitude of strain and vibration intensity at each position on the optical fiber 20 and a corresponding table to identify the amount of displacement at each position on the vehicle body frame 31 of the vehicle 30. This makes it possible to improve the accuracy of identifying the amount of displacement of the vehicle body frame 31 compared to the first embodiment described above. Furthermore, the other effects of this second embodiment are the same as those of the first embodiment described above.

[0041] <Embodiment 3> First, the configuration of the specific device 10B related to this disclosure will be described. Figure 7 is a block diagram showing an example configuration of the specific device 10B related to this disclosure.

[0042] As shown in Figure 7, the identification device 10B differs from the identification device 10 shown in Figure 2 in that it has an additional determination unit 14. The identification device 10B is located in the same position as the identification device 10 in Figure 1, for example, but is not limited to this.

[0043] The determination unit 14 uses the position of the vehicle body frame 31 of the vehicle 30 where displacement has occurred and the amount of displacement at that position to determine whether or not the vehicle 30 has an accident history. A position where displacement has occurred is, for example, a position where the amount of displacement is not zero.

[0044] For example, the determination unit 14 may maintain a learning model that has learned the location and amount of displacement of the vehicle frame for vehicles with an accident history. This learning model may be one that, when given the location and amount of displacement of the vehicle frame for a given vehicle as input, outputs a determination result regarding whether or not the vehicle has an accident history. In this case, the determination unit 14 inputs the location and amount of displacement of the vehicle frame 31 of vehicle 30 as input to the learning model, and obtains a determination result regarding whether or not vehicle 30 has an accident history as the output of this learning model. Furthermore, this learning model may be a learning model based on a convolutional neural network (CNN), etc.

[0045] Next, we will explain the operation flow of the specific device 10B related to this disclosure. Figure 8 is a flowchart illustrating an example of the operation flow of the specific device 10B according to this disclosure. Here, it is assumed that the specific unit 13 already holds a correspondence table as shown in Figure 3.

[0046] As shown in Figure 8, first, the same process as steps S11 to S13 shown in Figure 4, steps S31 to S33, is performed. Subsequently, the determination unit 14 uses the position of the vehicle body frame 31 of the vehicle 30 where displacement has occurred and the amount of displacement at that position to determine whether or not the vehicle 30 has a history of accidents (step S34).

[0047] As described above, according to this embodiment 3, the determination unit 14 uses the position of the vehicle body frame 31 of the vehicle 30 where displacement has occurred and the amount of displacement at that position to determine whether or not the vehicle 30 has a history of accidents. This makes it possible to determine whether or not the vehicle 30 has a history of accidents. Furthermore, the other effects of this third embodiment are the same as those of the first embodiment described above.

[0048] <Embodiment 4> First, the configuration of the specific device 10C related to this disclosure will be described. Figure 9 is a block diagram showing an example configuration of the specific device 10C related to this disclosure.

[0049] As shown in Figure 9, the specific device 10C differs from the specific device 10 shown in Figure 2 in that it has an additional display control unit 15. The specific device 10C is located in the same position as the specific device 10 in Figure 1, for example, but is not limited to this.

[0050] The display control unit 15 generates a screen that visualizes the displacement of each position of the vehicle body frame 31 of the vehicle 30, and displays the generated screen on a display device (not shown). The display device may be a display device provided inside the specific device 10C, or a display device provided outside the specific device 10C.

[0051] Figure 10 is a diagram illustrating an example of a screen generated by the display control unit 15 according to this disclosure. In Figure 10, the numerical values ​​at each position of the vehicle body frame 31 of the vehicle 30 indicate the displacement amount [mm].

[0052] In the example shown in Figure 10, the display control unit 15 shows the displacement not only of the positions of the vehicle frame 31 where displacement is occurring (i.e., positions where the displacement is not zero), but also of the positions where no displacement is occurring (i.e., positions where the displacement is zero). However, it is not limited to this. The display control unit 15 may show only the displacement of the positions of the vehicle frame 31 where displacement is occurring.

[0053] Next, we will explain the operation flow of the specific device 10C related to this disclosure. Figure 11 is a flowchart illustrating an example of the operation flow of the specific device 10C according to this disclosure. Here, it is assumed that the specific unit 13 already holds a correspondence table as shown in Figure 3.

[0054] As shown in Figure 11, first, the same process as steps S11 to S13 shown in Figure 4, steps S41 to S43, is performed. Subsequently, the display control unit 15 generates a screen that visualizes the displacement of each position of the vehicle body frame 31 of the vehicle 30, and displays the generated screen on the display device (step S44).

[0055] As described above, according to this embodiment 4, the display control unit 15 generates a screen that visualizes the displacement amount at each position of the vehicle body frame 31 of the vehicle 30, and displays the generated screen on the display device. This makes it possible to visually determine the displacement amount at each position of the vehicle body frame 31. Furthermore, the other effects of this embodiment 4 are the same as those of embodiment 1 described above.

[0056] <Hardware configuration of a specific device> Next, the hardware configuration of the computer 90 that implements the specific devices 10, 10A to 10C related to this disclosure will be described. Figure 12 is a block diagram showing an example of the hardware configuration of a computer 90 that implements the specific devices 10, 10A to 10C according to this disclosure.

[0057] As shown in Figure 12, the computer 90 includes a processor 91, memory 92, storage 93, input / output interface (I / F) 94, and communication interface (Communication I / F) 95, etc. The processor 91, memory 92, storage 93, input / output interface 94, and communication interface 95 are connected to each other by a data transmission path for sending and receiving data.

[0058] The processor 91 is a processing unit such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit). The memory 92 is a memory such as RAM (Random Access Memory) or ROM (Read Only Memory). The storage 93 is a storage device such as an HDD (Hard Disk Drive), SSD (Solid State Drive), or memory card. The storage 93 may also be a memory such as RAM or ROM.

[0059] A program is stored in the storage 93. This program includes a set of instructions (or software code) that, when loaded into a computer, causes the computer 90 to perform one or more functions of the specified devices 10, 10A to 10C described above. The components of the specified devices 10, 10A to 10C described above may also be realized by the processor 91 loading and executing the program stored in the storage 93. Furthermore, the storage function of the specified devices 10, 10A to 10C described above may be realized by memory 92 or storage 93.

[0060] Furthermore, the programs described above may be stored on non-temporary computer-readable media or tangible storage media. Examples, but not limited to, include RAM, ROM, flash memory, SSD or other memory technologies, CD (Compact Disc)-ROM, DVD (Digital Versatile Disc), Blu-ray® disc or other optical disc storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices. The programs may also be transmitted over temporary computer-readable media or communication media. Examples, but not limited to, include electrical, optical, acoustic or other forms of propagating signals.

[0061] The input / output interface 94 is connected to a display device 941, an input device 942, a sound output device 943, etc. The display device 941 is a device that displays a screen corresponding to the drawing data processed by the processor 91, such as an LCD (Liquid Crystal Display), a CRT (Cathode Ray Tube) display, or a monitor. The input device 942 is a device that receives operator input, such as a keyboard, mouse, and touch sensor. The display device 941 and the input device 942 may be integrated and implemented as a touch panel. The sound output device 943 is a device that outputs sound corresponding to the acoustic data processed by the processor 91, such as a speaker.

[0062] The communication interface 95 transmits and receives data to and from external devices. For example, the communication interface 95 communicates with external devices via a wired communication path or a wireless communication path.

[0063] Although the present disclosure has been described above with reference to embodiments, the present disclosure is not limited to the embodiments described above. Various modifications to the structure and details of the present disclosure are possible, as can be understood by those skilled in the art within the scope of the present disclosure. Furthermore, each embodiment can be combined with other embodiments as appropriate.

[0064] Furthermore, each drawing is merely illustrative to illustrate one or more embodiments. Each drawing may be associated not only with one specific embodiment but also with one or more other embodiments. As those skilled in the art will understand, various features or steps described with reference to any one drawing may be combined with features or steps shown in one or more other drawings to create embodiments that are not explicitly illustrated or described. Not all features or steps shown in any one drawing to illustrate an exemplary embodiment are necessarily required, and some features or steps may be omitted. The order of steps shown in any of the drawings may be changed as appropriate.

[0065] Furthermore, some or all of the embodiments described above may also be described as follows, but are not limited to these. (Note 1) A communication means for receiving backscattered light from an optical fiber installed in a vehicle, A detection means for detecting the magnitude of strain generated at each position on the optical fiber using the backscattered light, The system includes a correspondence table that associates positions on the optical fiber with positions on the vehicle's body frame, and a means for identifying the amount of displacement at each position on the vehicle's body frame using the magnitude of the distortion at each position on the optical fiber and the correspondence table. Specific equipment. (Note 2) The detection means further detects the vibration intensity of vibrations generated at each position on the optical fiber using the backscattered light, The identification means uses the magnitude of strain and vibration intensity at each position on the optical fiber and the corresponding table to determine the amount of displacement at each position on the vehicle frame. The specific device described in Appendix 1. (Note 3) The system further includes a determination means for determining whether or not the vehicle has a history of accidents, using the position of the vehicle frame where displacement has occurred and the amount of displacement at that position. The specific device described in Appendix 1. (Note 4) The system further includes a display control means that generates a screen visualizing the displacement of each position of the vehicle frame and displays the screen on a display device. The specific device described in Appendix 1. (Note 5) A specific method performed by a specific device, A receiving step in which backscattered light is received from an optical fiber installed in the vehicle, A detection step in which the magnitude of distortion generated at each position on the optical fiber is detected using the backscattered light, The system includes a step of maintaining a correspondence table that associates positions on the optical fiber with positions on the vehicle's body frame, and using the magnitude of the distortion at each position on the optical fiber and the correspondence table to determine the amount of displacement at each position on the vehicle's body frame. Specific method. (Note 6) On the computer, A receiving procedure for receiving backscattered light from an optical fiber installed in a vehicle, A detection procedure for detecting the magnitude of distortion generated at each position on the optical fiber using the backscattered light, The system maintains a correspondence table that associates positions on the optical fiber with positions on the vehicle's body frame, and performs a procedure to identify the amount of displacement at each position on the vehicle's body frame using the magnitude of the distortion at each position on the optical fiber and the correspondence table. program.

[0066] Furthermore, some or all of the elements (e.g., configuration and function) described in Appendices 2-4 that are subordinate to Appendice 1 may also be subordinate to Appendices 5 and 6 in the same manner as those described in Appendices 2-4. Some or all of the elements described in any appendice may be applied to various hardware, software, recording means, systems, and methods for recording software. [Explanation of Symbols]

[0067] 10,10A~10C specific equipment 11 Communications Department 12,12A detection unit 13,13A Specific part 14 Judgment Department 15 Display Control Unit 20 Fiber Optics 30 vehicles 31 Body frame 90 Computer 91 processors 92 memory 93 Storage 94 Input / Output Interfaces 941 Display device 942 Input device 943 Sound output device 95 Communication Interface

Claims

1. A communication means for receiving backscattered light from an optical fiber installed in a vehicle, A detection means for detecting the magnitude of strain generated at each position on the optical fiber using the backscattered light, The system includes a correspondence table that associates positions on the optical fiber with positions on the vehicle's body frame, and a means for identifying the amount of displacement at each position on the vehicle's body frame using the magnitude of the distortion at each position on the optical fiber and the correspondence table. Specific equipment.

2. The detection means further detects the vibration intensity of vibrations generated at each position on the optical fiber using the backscattered light, The identification means uses the magnitude of strain and vibration intensity at each position on the optical fiber and the corresponding table to determine the amount of displacement at each position on the vehicle frame. The specific device according to claim 1.

3. The system further includes a determination means for determining whether or not the vehicle has a history of accidents, using the position of the vehicle frame where displacement has occurred and the amount of displacement at that position. The specific device according to claim 1.

4. The system further includes a display control means that generates a screen visualizing the displacement of each position of the vehicle frame and displays the screen on a display device. The specific device according to claim 1.

5. A specific method performed by a specific device, A receiving step in which backscattered light is received from an optical fiber installed in the vehicle, A detection step in which the magnitude of distortion generated at each position on the optical fiber is detected using the backscattered light, The system includes a step of maintaining a correspondence table that associates positions on the optical fiber with positions on the vehicle's body frame, and using the magnitude of the distortion at each position on the optical fiber and the correspondence table to determine the amount of displacement at each position on the vehicle's body frame. Specific method.

6. On the computer, A receiving procedure for receiving backscattered light from an optical fiber installed in a vehicle, A detection procedure for detecting the magnitude of distortion generated at each position on the optical fiber using the backscattered light, The system maintains a correspondence table that associates positions on the optical fiber with positions on the vehicle's body frame, and performs a procedure to identify the amount of displacement at each position on the vehicle's body frame using the magnitude of the distortion at each position on the optical fiber and the correspondence table. program.

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