DETECTION SYSTEM, DETECTION APPARATUS, AND DETECTION METHOD

Abstract

A detection system (1) according to the present disclosure comprises: a first optical fiber cable (10-1) and a second optical fiber cable (10-2); a sensing unit (20) that uses each of the first optical fiber cable (10-1) and the second optical fiber cable (10-2) to perform optical fiber sensing, thereby acquiring first sensing data corresponding to the first optical fiber cable (10-1) and acquiring second sensing data corresponding to the second optical fiber cable (10-2); and an abnormality detection unit (30) that detects the occurrence of an abnormality in the first optical fiber cable (10-1) or the second optical fiber cable (10-2) on the basis of both the first optical fiber cable (10-1) and the second optical fiber cable (10-2).

Description

[Technical field]

[0001] The present disclosure relates to a detection system, a detection device, and a detection method. [Background technology]

[0002] In recent years, a technology called optical fiber sensing, which uses optical fibers as sensors to perform sensing, has been attracting attention.

[0003] An example of optical fiber sensing is interferometric optical fiber sensing. For example, Patent Document 1 discloses a technology for detecting a physical quantity by performing interferometric optical fiber sensing using interference light generated by interference between reflected light received from a sensing fiber and reflected light received from a reference fiber.

[0004] Another example of optical fiber sensing is distributed fiber optic sensing (DFOS), which is a type of distributed vibration sensing (DVS). For example, Patent Document 2 discloses a technology for detecting the environment around an optical fiber cable (for example, the state of structures such as utility poles) by performing distributed optical fiber sensing. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2008-175746 A [Patent Document 2] International Publication No. 2021 / 070222 Summary of the Invention [Problem to be solved by the invention]

[0006] As described above, the technology disclosed in Patent Document 2 detects the environment around the optical fiber cable by performing distributed optical fiber sensing. However, there are cases where an abnormality occurs in the optical fiber cable itself (for example, damage caused by animals feeding on it). When an abnormality occurs in the optical fiber cable itself, the detection result also fluctuates.

[0007] However, the technology disclosed in Patent Document 2 has the problem that it is difficult to determine whether fluctuations in the detection results are due to fluctuations in the environment around the optical fiber cable or due to an abnormality occurring in the optical fiber cable itself.

[0008] Therefore, an object of the present disclosure is to provide a detection system, a detection device, and a detection method that can solve the above-mentioned problems and detect the occurrence of an abnormality in the optical fiber cable itself. [Means for solving the problem]

[0009] A detection system according to one embodiment comprises: a first optical fiber cable and a second optical fiber cable; a sensing unit that performs optical fiber sensing using each of the first optical fiber cable and the second optical fiber cable to obtain first sensing data corresponding to the first optical fiber cable and obtain second sensing data corresponding to the second optical fiber cable; an abnormality detection unit that detects an occurrence of an abnormality in the first optical fiber cable or the second optical fiber cable based on both the first sensing data and the second sensing data; Equipped with.

[0010] A detection device according to one aspect comprises: an acquisition unit that acquires first sensing data corresponding to the first optical fiber cable and second sensing data corresponding to the second optical fiber cable from a sensing unit that performs optical fiber sensing using each of the first optical fiber cable and the second optical fiber cable; an abnormality detection unit that detects an occurrence of an abnormality in the first optical fiber cable or the second optical fiber cable based on both the first sensing data and the second sensing data; Equipped with.

[0011] A detection method according to one embodiment includes the steps of: A detection method using a detection device, comprising: an acquiring step of acquiring first sensing data corresponding to the first optical fiber cable and acquiring second sensing data corresponding to the second optical fiber cable from a sensing unit that performs optical fiber sensing using each of the first optical fiber cable and the second optical fiber cable; an abnormality detection step of detecting an occurrence of an abnormality in the first optical fiber cable or the second optical fiber cable based on both the first sensing data and the second sensing data; Includes. Effect of the Invention

[0012] According to the above-mentioned aspects, it is possible to provide a detection system, a detection device, and a detection method that can detect the occurrence of an abnormality in the optical fiber cable itself. [Brief description of the drawings]

[0013] [Figure 1] 1 is a diagram illustrating a configuration example of a detection system according to a first embodiment. [Diagram 2] FIG. 4 is a diagram showing a modified configuration example of the detection system according to the first embodiment. [Diagram 3]4 is a flow diagram illustrating an example of a schematic operation flow when detecting the occurrence of an abnormality in the first optical fiber cable or the second optical fiber cable in the detection system according to the first embodiment. FIG. [Figure 4] FIG. 11 is a diagram illustrating a configuration example of a detection system according to a second embodiment. [Diagram 5] FIG. 13 is a diagram illustrating an example in which the difference value between the vibration intensity indicated by the first sensing data and the vibration intensity indicated by the second sensing data fluctuates when an abnormality occurs in either the first optical fiber cable or the second optical fiber cable. [Figure 6] 13 is a flow diagram illustrating an example of a schematic operation flow when detecting the occurrence of an abnormality in the first optical fiber cable or the second optical fiber cable in the detection system according to the second embodiment. FIG. [Figure 7] FIG. 13 is a diagram illustrating an example of a correspondence table used by an abnormality detection unit according to another embodiment. [Figure 8] FIG. 2 is a block diagram showing an example of a hardware configuration of a computer that realizes a detection device according to each embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. Note that the following description and drawings are omitted and simplified as appropriate for clarity of explanation. In addition, in each of the following drawings, the same elements are given the same reference numerals, and duplicate explanations are omitted as necessary.

[0015] <Embodiment 1> First, with reference to FIG. 1, a configuration example of a detection system 1 according to the first embodiment will be described. As shown in FIG. 1, the detection system 1 according to the first embodiment includes a first optical fiber cable 10-1, a second optical fiber cable 10-2, a sensing unit 20, and an abnormality detection unit 30. The first optical fiber cable 10-1 is a first optical fiber cable 10-2.

[0016] The first optical fiber cable 10-1 includes at least one first optical fiber 11-1, and the second optical fiber cable 10-2 includes at least one second optical fiber 11-2.

[0017] The first optical fiber cable 10-1 and the second optical fiber cable 10-2 are arranged to extend substantially parallel to each other. The first optical fiber cable 10-1 and the second optical fiber cable 10-2 are arranged adjacent to each other. For example, the first optical fiber cable 10-1 and the second optical fiber cable 10-2 may be arranged in close contact with each other or at a predetermined interval.

[0018] In FIG. 1, two optical fiber cables, the first optical fiber cable 10-1 and the second optical fiber cable 10-2, are provided, but the number of optical fiber cables is not limited to two and may be three or more.

[0019] The sensing unit 20 performs optical fiber sensing using each of the first optical fiber cable 10-1 and the second optical fiber cable 10-2. For example, the sensing unit 20 performs distributed optical fiber sensing. As a result, the sensing unit 20 acquires first sensing data indicating the detection result detected by the first optical fiber cable 10-1 (e.g., vibrations occurring around the first optical fiber cable 10-1) and acquires second sensing data indicating the detection result detected by the second optical fiber cable 10-2 (e.g., vibrations occurring around the second optical fiber cable 10-2).

[0020] The abnormality detection unit 30 detects the occurrence of an abnormality in the first optical fiber cable 10-1 or the second optical fiber cable 10-2 based on both the first sensing data and the second sensing data acquired by the sensing unit 20.

[0021] The anomaly detection unit 30 may be provided in the same device as the sensing unit 20, or in a device separate from the sensing unit 20, or may be provided on the cloud. Fig. 2 shows a configuration example of a detection system 1A in which the anomaly detection unit 30 is provided in a device (detection device 300A) separate from the sensing unit 20. In the detection system 1A shown in Fig. 2, an acquisition unit 31 that acquires first sensing data and second sensing data from the sensing unit 20 is added to the detection device 300A.

[0022] Next, with reference to FIG. 3, an example of a schematic operation flow when detecting the occurrence of an abnormality in the first optical fiber cable 10-1 or the second optical fiber cable 10-2 in the detection system 1 according to the first embodiment will be described.

[0023] 3, first, the sensing unit 20 executes optical fiber sensing using each of the first optical fiber cable 10-1 and the second optical fiber cable 10-2. As a result, the sensing unit 20 acquires first sensing data corresponding to the first optical fiber cable 10-1 and second sensing data corresponding to the second optical fiber cable 10-2 (step S101).

[0024] Thereafter, the abnormality detection unit 30 detects the occurrence of an abnormality in the first optical fiber cable 10-1 or the second optical fiber cable 10-2 based on both the first sensing data and the second sensing data acquired by the sensing unit 20 (step S102).

[0025] As described above, according to the first embodiment, the sensing unit 20 performs optical fiber sensing using each of the first optical fiber cable 10-1 and the second optical fiber cable 10-2 to obtain first sensing data corresponding to the first optical fiber cable 10-1 and second sensing data corresponding to the second optical fiber cable 10-2. The abnormality detection unit 30 detects the occurrence of an abnormality in the first optical fiber cable 10-1 or the second optical fiber cable 10-2 based on both the first sensing data and the second sensing data. This makes it possible to detect the occurrence of an abnormality in the first optical fiber cable 10-1 or the second optical fiber cable 10-2 itself.

[0026] <Embodiment 2> The second embodiment is a specific example of the first embodiment, and is an example in which the traveling state of vehicles around the optical fiber cable is detected as the surrounding environment of the optical fiber cable.

[0027] First, with reference to FIG. 4, a configuration example of a detection system 1B according to the second embodiment will be described. As shown in Fig. 4, a detection system 1B according to the second embodiment includes a first optical fiber cable 100-1, a second optical fiber cable 100-2, a sensing device 200, and a detection device 300B. Fig. 4 shows a state in which an abnormality (here, human damage caused by a blade) has occurred in the first optical fiber cable 100-1.

[0028] The first optical fiber cable 100-1 and the second optical fiber cable 100-2 correspond to the first optical fiber cable 10-1 and the second optical fiber cable 10-2 in the above-mentioned first embodiment. Hereinafter, when it is not specified whether it is the first optical fiber cable 100-1 or the second optical fiber cable 100-2, it will be appropriately referred to as "optical fiber cable 100". Furthermore, the sensing device 200 corresponds to the sensing unit 20 in the above-mentioned first embodiment. Furthermore, the later-described abnormality detection unit 303 and acquisition unit 301 in the detection device 300B correspond to the abnormality detection unit 30 and acquisition unit 31 in the above-mentioned first embodiment, respectively.

[0029] The first optical fiber cable 100-1 includes at least one first optical fiber 101-1, and the second optical fiber cable 100-2 includes at least one second optical fiber 101-2.

[0030] The first optical fiber cable 100-1 and the second optical fiber cable 100-2 are arranged so as to extend substantially parallel to each other along a road (not shown). In Fig. 4, the first optical fiber cable 100-1 and the second optical fiber cable 100-2 are arranged inside a truss 103 installed along the road, but the arrangement is not limited to this and may be arranged along the road.

[0031] In addition, the first optical fiber cable 100-1 and the second optical fiber cable 100-2 are disposed adjacent to each other. For example, the first optical fiber cable 100-1 and the second optical fiber cable 100-2 may be disposed in close contact with each other or may be disposed with a predetermined interval therebetween.

[0032] In addition, in FIG. 4, two optical fiber cables, the first optical fiber cable 100-1 and the second optical fiber cable 100-2, are provided, but the number of optical fiber cables 100 is not limited to two and may be three or more.

[0033] Sensing device 200 performs distributed optical fiber sensing using first optical fiber cable 100-1 and second optical fiber cable 100-2, and includes first DFOS section 201 and second DFOS section 202. First DFOS section 201 and second DFOS section 202 are realized by, for example, a DVS. Note that, although first DFOS section 201 and second DFOS section 202 are provided in the same device (sensing device 200) in Fig. 4, they may be provided in separate devices.

[0034] When performing distributed optical fiber sensing, the first DFOS unit 201 injects pulsed light into the first optical fiber 101-1 that constitutes the first optical fiber cable 100-1, and receives, via the first optical fiber 101-1, backscattered light generated as the pulsed light is transmitted through the first optical fiber 101-1.

[0035] Here, when a vehicle travels around the first optical fiber cable 100-1, vibrations are generated and transmitted to the first optical fiber cable 100-1. As a result, the characteristics (e.g., wavelength) of the backscattered light transmitted through the first optical fiber 101-1 constituting the first optical fiber cable 100-1 change. Therefore, the first optical fiber cable 100-1 can detect vibrations generated by the vehicle traveling around the first optical fiber cable 100-1.

[0036] In addition, the backscattered light transmitted through the first optical fiber 101-1 has characteristics that change depending on the vibrations generated by the vehicle traveling on the first optical fiber cable 100-1, and therefore includes first sensing data that indicates vibration data of the vibrations.

[0037] Therefore, the first DFOS unit 201 acquires first sensing data indicating vibration data of vibrations generated by vehicles traveling around the first optical fiber cable 100-1 by performing distributed optical fiber sensing.

[0038] Similarly, when the second DFOS unit 202 executes distributed optical fiber sensing, it inputs pulsed light to the second optical fiber 101-2 constituting the second optical fiber cable 100-2, and receives backscattered light generated as the pulsed light is transmitted through the second optical fiber 101-2 via the second optical fiber 101-2. Then, the second DFOS unit 202 acquires second sensing data indicating vibration data of vibrations generated by the running of vehicles around the second optical fiber cable 100-2.

[0039] The detection device 300B includes an acquisition unit 301, an environment detection unit 302, and an abnormality detection unit 303. The acquisition unit 301 acquires the first sensing data from the first DFOS unit 201 and acquires the second sensing data from the second DFOS unit 202 .

[0040] Here, the first sensing data indicates vibration data of vibrations generated by vehicles traveling around the first optical fiber cable 100-1, and the second sensing data indicates vibration data of vibrations generated by vehicles traveling around the second optical fiber cable 100-2. The first optical fiber cable 100-1 and the second optical fiber cable 100-2 are disposed adjacent to each other.

[0041] Therefore, the environment detection unit 302 detects the traveling conditions of the vehicles around the first optical fiber cable 100-1 and the second optical fiber cable 100-2 based on at least one of the first sensing data and the second sensing data.

[0042] Furthermore, when both the first optical fiber cable 100-1 and the second optical fiber cable 100-2 are normal, the difference between the vibration intensity indicated by the first sensing data and the vibration intensity indicated by the second sensing data is the difference in vibration intensity according to the positional relationship between the first optical fiber cable 100-1 and the second optical fiber cable 100-2. Therefore, as long as the positional relationship between the first optical fiber cable 100-1 and the second optical fiber cable 100-2 does not change, the above-mentioned difference value will be a substantially constant value.

[0043] However, when an abnormality (e.g., damage caused by animals feeding) occurs in either the first optical fiber cable 100-1 or the second optical fiber cable 100-2, a fluctuation occurs only in the first sensing data or the second sensing data corresponding to the optical fiber cable 100 in which the abnormality occurred (e.g., the value of vibration intensity indicated by the sensing data fluctuates from the normal value of the optical fiber cable 100 by exceeding a predetermined threshold value; the same applies below). As a result, the above-mentioned difference value, which is an approximately constant value under normal circumstances, fluctuates (e.g., the difference value fluctuates from the normal value of the optical fiber cable 100 by exceeding a predetermined threshold value; the same applies below).

[0044] Here, referring to Fig. 5, it will be described that the above-mentioned difference value fluctuates when an abnormality occurs in either the first optical fiber cable 100-1 or the second optical fiber cable 100-2. Fig. 5 shows an example in which an abnormality (damage) occurs in the first optical fiber cable 100-1. In Fig. 5, the first sensing data and the second sensing data show vibration data of vibrations detected at positions on the first optical fiber cable 100-1 and the second optical fiber cable 100-2, which are at the same distance from the sensing device 200, respectively, with the horizontal axis representing time and the vertical axis representing vibration intensity.

[0045] As shown in FIG. 5, the second sensing data corresponding to the normal second optical fiber cable 100-2 only shows vibrations that occur in response to the running of the vehicle. On the other hand, the second sensing data corresponding to the first optical fiber cable 100-1 in which an abnormality (damage) has occurred includes vibrations occurring in response to the traveling of the vehicle as well as vibrations occurring in response to the abnormality (damage).

[0046] As a result, a peak occurs in the difference between the vibration intensity indicated by the first sensing data and the vibration intensity indicated by the second sensing data. This peak does not occur when both the first optical fiber cable 100-1 and the second optical fiber cable 100-2 are normal.

[0047] Therefore, the abnormality detection unit 303 detects the occurrence of an abnormality in the first optical fiber cable 100-1 or the second optical fiber cable 100-2 based on the difference value between the vibration intensity indicated by the first sensing data and the vibration intensity indicated by the second sensing data.

[0048] Types of abnormalities in the optical fiber cable 100 include damage to the optical fiber cable 100 caused by animals feeding on the optical fiber cable 100, human damage to the optical fiber cable 100 using a blade or the like, deterioration of the optical fiber cable 100, external pressure on the optical fiber cable 100 (for example, external pressure caused by misalignment of the trough 102), etc.

[0049] Next, with reference to FIG. 6, an example of a schematic operational flow when detecting the occurrence of an abnormality in the first optical fiber cable 100-1 or the second optical fiber cable 100-2 in the detection system 1B according to the second embodiment will be described.

[0050] 6, first, the sensing device 200 executes distributed optical fiber sensing using each of the first optical fiber cable 100-1 and the second optical fiber cable 100-2. As a result, the sensing device 200 acquires first sensing data corresponding to the first optical fiber cable 100-1 and second sensing data corresponding to the second optical fiber cable 100-2 (step S201).

[0051] Thereafter, in the detection device 300B, the acquisition unit 301 acquires the first sensing data and the second sensing data acquired by the sensing device 200. Then, the abnormality detection unit 303 detects the occurrence of an abnormality in the first optical fiber cable 100-1 or the second optical fiber cable 100-2 based on the difference value between the vibration intensity indicated by the first sensing data and the vibration intensity indicated by the second sensing data (step S202).

[0052] As described above, according to the second embodiment, the sensing device 200 executes distributed optical fiber sensing using each of the first optical fiber cable 100-1 and the second optical fiber cable 100-2 to obtain first sensing data corresponding to the first optical fiber cable 100-1 and second sensing data corresponding to the second optical fiber cable 100-2. The detection device 300B detects the occurrence of an abnormality in the first optical fiber cable 100-1 or the second optical fiber cable 100-2 based on the difference value between the vibration intensity indicated by the first sensing data and the vibration intensity indicated by the second sensing data. This makes it possible to detect the occurrence of an abnormality in the first optical fiber cable 100-1 or the second optical fiber cable 100-2 itself.

[0053] <Other embodiments> The abnormality detection unit 303 according to the above-described second embodiment can add or modify operations as follows.

[0054] The anomaly detection unit 303 does not need to constantly monitor the difference between the vibration intensity indicated by the first sensing data and the vibration intensity indicated by the second sensing data, and may monitor the above-mentioned difference when a change occurs in either the first sensing data or the second sensing data. This configuration makes it possible to reduce the processing load of the anomaly detection unit 303 compared to a configuration in which the above-mentioned difference is constantly monitored.

[0055] In addition, when the abnormality detection unit 303 detects the occurrence of an abnormality in the first optical fiber cable 100-1 or the second optical fiber cable 100-2 based on the above-mentioned difference value, it may identify the optical fiber cable 100 corresponding to the sensing data in which a fluctuation is occurring, between the first sensing data and the second sensing data, as the optical fiber cable 100 in which the abnormality has occurred.

[0056] In addition, the abnormality detection unit 303 may detect the occurrence of an abnormality in the first optical fiber cable 100-1 or the second optical fiber cable 100-2 based on the above-mentioned difference value, and if fluctuations occur in both the first sensing data and the second sensing data, may determine that an abnormality has occurred in both the first optical fiber cable 100-1 and the second optical fiber cable 100-2.

[0057] Furthermore, the abnormality detection unit 303 may notify a system user of an abnormality in the optical fiber cable 100. In this case, the abnormality detection unit 303 may transmit a GUI (Graphical User Interface) screen showing the optical fiber cable 100 in which an abnormality has occurred to a terminal (not shown) of the system user.

[0058] Furthermore, the abnormality detection unit 303 can specify the position (distance from the sensing device 200) at which the first sensing data included in the backscattered light was detected, based on the time difference between the time when the first DFOS unit 201 inputs pulsed light to the first optical fiber cable 100-1 and the time when the first DFOS unit 201 receives the backscattered light from the first optical fiber cable 100-1. By using this, the abnormality detection unit 303 may specify the position (distance from the sensing device 200) at which the abnormality occurred on the first optical fiber cable 100-1 when an abnormality occurs on the first optical fiber cable 100-1. Also, a correspondence table as shown in FIG. 7, which associates the distance from the sensing device 200 with the latitude and longitude information at that distance, may be stored in advance in a memory (not shown) or the like. In this case, the abnormality detection unit 303 may specify the latitude and longitude of the position at which the abnormality occurred on the first optical fiber cable 100-1, using the correspondence table shown in FIG. 7. Similarly, the abnormality detection unit 303 may identify the location (distance or latitude and longitude from the sensing device 200) where the abnormality has occurred on the second optical fiber cable 100-2.

[0059] Furthermore, the abnormality detection unit 303 may notify a system user of the location (distance from the sensing device 200 or latitude and longitude) where the abnormality has occurred on the optical fiber cable 100. In this case, the abnormality detection unit 303 may transmit a GUI screen showing the location where the abnormality has occurred on the optical fiber cable 100 to a terminal (not shown) of the system user.

[0060] As described above, types of abnormalities in the optical fiber cable 100 include damage to the optical fiber cable 100 caused by animals feeding on the optical fiber cable 100, human damage to the optical fiber cable 100 using a blade or the like, deterioration of the optical fiber cable 100, external pressure on the optical fiber cable 100, etc. The above-mentioned patterns of difference values ​​are unique fluctuation patterns that differ in the strength of peaks, the positions at which peaks occur, the number of peaks, etc., depending on the type of abnormality.

[0061] Therefore, the abnormality detection unit 303 may use the fact that the above-mentioned difference value pattern is a unique fluctuation pattern according to the type of abnormality to identify the type of abnormality that has occurred in the optical fiber cable 100. As a method for this identification, for example, the following is considered.

[0062] The anomaly detection unit 303 prepares, for each type of anomaly in the optical fiber cable 100, a plurality of pairs of teacher data indicating the anomaly and a pattern of difference values ​​when the anomaly occurs, and sequentially inputs the prepared plurality of pairs to pre-construct a learning model using a Convolutional Neural Network (CNN), which is then pre-stored in a memory (not shown) or the like.

[0063] When the abnormality detection unit 303 detects the occurrence of an abnormality in the optical fiber cable 100 based on the above-mentioned difference value, the abnormality detection unit 303 inputs the above-mentioned pattern of the difference value into the learning model. As a result, the abnormality detection unit 303 obtains information on the type of abnormality as an output result of the learning model.

[0064] <Hardware configuration of the detection device according to each embodiment> Next, with reference to FIG. 8, a hardware configuration of a computer 400 that realizes the detection devices 300A and 300B according to the above-mentioned first and second embodiments will be described. 8, the computer 400 includes a processor 401, a memory 402, a storage 403, an input / output interface (input / output I / F) 404, and a communication interface (communication I / F) 405. The processor 401, the memory 402, the storage 403, the input / output interface 404, and the communication interface 405 are connected by a data transmission path for transmitting and receiving data to and from each other.

[0065] The processor 401 is, for example, a processing device such as a central processing unit (CPU) or a graphics processing unit (GPU). The memory 402 is, for example, a random access memory (RAM) or a read only memory (ROM). The storage 403 is, for example, a storage device such as a hard disk drive (HDD), a solid state drive (SSD), or a memory card. The storage 403 may also be a memory such as a RAM or a ROM.

[0066] A program is stored in the storage 403. When the program is loaded into a computer, it includes a set of instructions (or software code) for causing the computer 400 to perform one or more functions of the above-mentioned detection devices 300A and 300B. The acquisition units 31 and 301, the environment detection unit 302, and the anomaly detection units 30 and 303 in the above-mentioned detection devices 300A and 300B may be realized by the processor 401 loading and executing a program stored in the storage 403. In addition, the storage function in the above-mentioned detection devices 300A and 300B may be realized by the memory 402 or the storage 403.

[0067] The above programs may also be stored on non-transitory computer-readable media or tangible storage media. By way of example and not limitation, computer-readable media or tangible storage media include RAM, ROM, flash memory, SSD or other memory technology, CD (Compact Disc)-ROM, DVD (Digital Versatile Disc), Blu-ray (registered trademark) disk or other optical disk storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage device. The programs may also be transmitted on a transitory computer-readable medium or communication medium. By way of example and not limitation, transitory computer-readable media or communication media include electrical, optical, acoustic, or other forms of propagated signals.

[0068] The input / output interface 404 is connected to a display device 4041, an input device 4042, a sound output device 4043, and the like. The display device 4041 is a device that displays a screen corresponding to drawing data processed by the processor 401, such as an LCD (Liquid Crystal Display), a CRT (Cathode Ray Tube) display, or a monitor. The input device 4042 is a device that accepts an operation input by an operator, and is, for example, a keyboard, a mouse, or a touch sensor. The display device 4041 and the input device 4042 may be integrated and realized as a touch panel. The sound output device 4043 is a device that acoustically outputs a sound corresponding to the sound data processed by the processor 401, such as a speaker.

[0069] The communication interface 405 transmits and receives data to and from an external device. For example, the communication interface 405 communicates with the external device via a wired communication path or a wireless communication path.

[0070] Although the present disclosure has been described above with reference to the embodiments, the present disclosure is not limited to the above-described embodiments. Various modifications that can be understood by a person skilled in the art can be made to the configuration and details of the present disclosure within the scope of the present disclosure.

[0071] For example, in the above embodiment, an example of detecting the vehicle running state as the surrounding environment of the optical fiber cable has been described, but the present disclosure is not limited thereto. For example, the present disclosure can also be applied to a detection system that detects an intruder or detects the state of a structure such as a utility pole as the surrounding environment of the optical fiber cable.

[0072] Furthermore, some or all of the above-described embodiments can be described as, but are not limited to, the following supplementary notes. (Appendix 1) a first optical fiber cable and a second optical fiber cable; a sensing unit that performs optical fiber sensing using each of the first optical fiber cable and the second optical fiber cable to obtain first sensing data corresponding to the first optical fiber cable and obtain second sensing data corresponding to the second optical fiber cable; an abnormality detection unit that detects an occurrence of an abnormality in the first optical fiber cable or the second optical fiber cable based on both the first sensing data and the second sensing data; A detection system comprising: (Appendix 2) each of the first sensing data and the second sensing data includes vibration data; the abnormality detection unit detects the occurrence of the abnormality based on a difference value between a vibration intensity indicated by the first sensing data and a vibration intensity indicated by the second sensing data. 2. The detection system of claim 1. (Appendix 3) When the abnormality detection unit detects the occurrence of the abnormality based on the difference value, the abnormality detection unit identifies the first optical fiber cable or the second optical fiber cable corresponding to one of the first sensing data and the second sensing data in which a fluctuation has occurred as the optical fiber cable in which the abnormality has occurred. 3. The detection system of claim 2. (Appendix 4) the abnormality detection unit monitors the difference value using a fluctuation in either the first sensing data or the second sensing data as a trigger. 4. The detection system according to claim 2 or 3. (Appendix 5) The abnormality includes damage caused by animal feeding. 5. A detection system according to any one of claims 1 to 4. (Appendix 6) the sensing unit acquires the first sensing data and the second sensing data by performing distributed optical fiber sensing using each of the first optical fiber cable and the second optical fiber cable. 6. A detection system according to any one of claims 1 to 5. (Appendix 7) and an environment detection unit that detects an environment around the first optical fiber cable and the second optical fiber cable based on at least one of the first sensing data and the second sensing data. 7. A detection system according to any one of claims 1 to 6. (Appendix 8) an acquisition unit that acquires first sensing data corresponding to the first optical fiber cable and second sensing data corresponding to the second optical fiber cable from a sensing unit that performs optical fiber sensing using each of the first optical fiber cable and the second optical fiber cable; an abnormality detection unit that detects an occurrence of an abnormality in the first optical fiber cable or the second optical fiber cable based on both the first sensing data and the second sensing data; A detection device comprising: (Appendix 9) each of the first sensing data and the second sensing data includes vibration data; the abnormality detection unit detects the occurrence of the abnormality based on a difference value between a vibration intensity indicated by the first sensing data and a vibration intensity indicated by the second sensing data. 9. The detection device according to claim 8. (Appendix 10) When the abnormality detection unit detects the occurrence of the abnormality based on the difference value, the abnormality detection unit identifies the first optical fiber cable or the second optical fiber cable corresponding to one of the first sensing data and the second sensing data in which a fluctuation has occurred as the optical fiber cable in which the abnormality has occurred. 10. The detection apparatus of claim 9. (Appendix 11) the abnormality detection unit monitors the difference value using a fluctuation in either the first sensing data or the second sensing data as a trigger. 11. The detection device according to claim 9 or 10. (Appendix 12) The abnormality includes damage caused by animal feeding. 12. A detection device according to any one of claims 8 to 11. (Appendix 13) the sensing unit performs distributed optical fiber sensing using each of the first optical fiber cable and the second optical fiber cable. 13. A detection device according to any one of claims 8 to 12. (Appendix 14) and an environment detection unit that detects an environment around the first optical fiber cable and the second optical fiber cable based on at least one of the first sensing data and the second sensing data. 14. A detection device according to any one of claims 8 to 13. (Appendix 15) A detection method using a detection device, comprising: an acquiring step of acquiring first sensing data corresponding to the first optical fiber cable and acquiring second sensing data corresponding to the second optical fiber cable from a sensing unit that performs optical fiber sensing using each of the first optical fiber cable and the second optical fiber cable; an abnormality detection step of detecting an occurrence of an abnormality in the first optical fiber cable or the second optical fiber cable based on both the first sensing data and the second sensing data; A detection method comprising: (Appendix 16) each of the first sensing data and the second sensing data includes vibration data; In the abnormality detection step, occurrence of the abnormality is detected based on a difference value between a vibration intensity indicated by the first sensing data and a vibration intensity indicated by the second sensing data. The detection method described in Appendix 15. (Appendix 17) In the abnormality detection step, when the occurrence of the abnormality is detected based on the difference value, the first optical fiber cable or the second optical fiber cable corresponding to one of the first sensing data and the second sensing data in which a fluctuation has occurred is identified as the optical fiber cable in which the abnormality has occurred. The detection method described in Appendix 16. (Appendix 18) In the anomaly detection step, the difference value is monitored using a fluctuation in either the first sensing data or the second sensing data as a trigger. 18. The detection method according to claim 16 or 17. (Appendix 19) The abnormality includes damage caused by animal feeding. 19. The detection method according to any one of appendix 15 to 18. (Appendix 20) the sensing unit performs distributed optical fiber sensing using each of the first optical fiber cable and the second optical fiber cable. 20. A detection method according to any one of claims 15 to 19. (Appendix 21) and further comprising an environment detection step of detecting an environment around the first optical fiber cable and the second optical fiber cable based on at least one of the first sensing data and the second sensing data. 21. The detection method according to any one of claims 15 to 20. [Explanation of symbols]

[0073] 1,1A,1B Detection System 10-1,100-1 First optical fiber cable 10-2,100-2 Second optical fiber cable 11-1, 101-1 First optical fiber 11-2,101-2 Second optical fiber 20 Sensing section 30,303 Anomaly detection unit 31,301 Acquisition Department 200 Sensing Device 201 1st DFOS Department 202 2nd DFOS Department 300A, 300B Detector 302 Environment Detection Unit 400 Computers 401 Processor 402 Memory 403 Storage 404 Input / Output Interface 4041 Display device 4042 Input Device 4043 Sound output device 405 Communication Interface

Claims

1. a first optical fiber cable and a second optical fiber cable; a sensing unit that performs optical fiber sensing using each of the first optical fiber cable and the second optical fiber cable to obtain first sensing data corresponding to the first optical fiber cable and obtain second sensing data corresponding to the second optical fiber cable; an abnormality detection unit that detects an occurrence of an abnormality in the first optical fiber cable or the second optical fiber cable based on both the first sensing data and the second sensing data; Equipped with Each of the first sensing data and the second sensing data includes vibration data; the abnormality detection unit detects the occurrence of the abnormality based on a difference value between a vibration intensity indicated by the first sensing data and a vibration intensity indicated by the second sensing data. Detection system.

2. an acquisition unit that acquires first sensing data corresponding to the first optical fiber cable and second sensing data corresponding to the second optical fiber cable from a sensing unit that performs optical fiber sensing using each of the first optical fiber cable and the second optical fiber cable; an abnormality detection unit that detects an occurrence of an abnormality in the first optical fiber cable or the second optical fiber cable based on both the first sensing data and the second sensing data; Equipped with Each of the first sensing data and the second sensing data includes vibration data; the abnormality detection unit detects the occurrence of the abnormality based on a difference value between a vibration intensity indicated by the first sensing data and a vibration intensity indicated by the second sensing data. Detection device.

3. When the abnormality detection unit detects the occurrence of the abnormality based on the difference value, the abnormality detection unit identifies the first optical fiber cable or the second optical fiber cable corresponding to one of the first sensing data and the second sensing data in which a fluctuation has occurred as the optical fiber cable in which the abnormality has occurred.

3. The detection device according to claim 2.

4. the abnormality detection unit monitors the difference value using a fluctuation in either the first sensing data or the second sensing data as a trigger. Detecting device according to claim 2 or 3.

5. The abnormality includes damage caused by animal feeding.

5. A detection device according to claim 2.

6. the sensing unit performs distributed optical fiber sensing using each of the first optical fiber cable and the second optical fiber cable.

6. A detection device according to claim 2.

7. an environment detection unit that detects an environment around the first optical fiber cable and the second optical fiber cable based on at least one of the first sensing data and the second sensing data; 7. A detection device according to any one of claims 2 to 6.

8. A detection method using a detection device, comprising: an acquiring step of acquiring first sensing data corresponding to the first optical fiber cable and acquiring second sensing data corresponding to the second optical fiber cable from a sensing unit that performs optical fiber sensing using each of the first optical fiber cable and the second optical fiber cable; an abnormality detection step of detecting an occurrence of an abnormality in the first optical fiber cable or the second optical fiber cable based on both the first sensing data and the second sensing data; Including, Each of the first sensing data and the second sensing data includes vibration data; In the abnormality detection step, occurrence of the abnormality is detected based on a difference value between a vibration intensity indicated by the first sensing data and a vibration intensity indicated by the second sensing data. Detection methods.

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