WO2024057379A1 - Système de détection de fibre optique, dispositif de détection de fibre optique et procédé de détection de rupture - Google Patents

Système de détection de fibre optique, dispositif de détection de fibre optique et procédé de détection de rupture Download PDF

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WO2024057379A1
WO2024057379A1 PCT/JP2022/034145 JP2022034145W WO2024057379A1 WO 2024057379 A1 WO2024057379 A1 WO 2024057379A1 JP 2022034145 W JP2022034145 W JP 2022034145W WO 2024057379 A1 WO2024057379 A1 WO 2024057379A1
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optical fiber
far end
end position
distance
score
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PCT/JP2022/034145
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English (en)
Japanese (ja)
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忠行 岩野
幸英 依田
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日本電気株式会社
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Priority to PCT/JP2022/034145 priority Critical patent/WO2024057379A1/fr
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for

Definitions

  • the present disclosure relates to an optical fiber sensing system, an optical fiber sensing device, and a break detection method.
  • optical fiber sensing which uses optical fibers as sensors, has been attracting attention.
  • Optical fiber sensing is mainly realized by an optical fiber and an optical fiber sensing device connected to the optical fiber.
  • An optical fiber sensing device transmits pulsed light to an optical fiber and receives backscattered light in response to the pulsed light from the optical fiber as an optical signal.
  • Optical fiber sensing equipment detects vibrations, sound, temperature changes, etc. occurring in optical fibers, and identifies locations where these vibrations occur, based on optical signals.
  • the optical fiber sensing equipment can further detect an abnormality in the monitored object based on the detected vibration, etc. It is also possible to specify the location where the image was detected.
  • the optical fiber sensing device will no longer be able to obtain data at positions beyond the break location. Therefore, if the optical fiber sensing device detects an abnormality based on data at a position beyond the rupture location, it will no longer be able to detect the abnormality.
  • Patent Document 1 describes a technique for detecting a disconnection such as a break in an optical fiber if Fresnel reflected light is detected when test light is incident on an optical fiber.
  • Patent Document 1 is a technique for detecting Fresnel reflected light, it is considered possible to detect the far end position of an optical fiber.
  • an object of the present disclosure is to provide an optical fiber sensing system, an optical fiber sensing device, and a break detection method that are capable of detecting a break in an optical fiber.
  • a fiber optic sensing system includes: optical fiber and a communication unit that transmits pulsed light to the optical fiber and receives an optical signal from the optical fiber; a far end detection unit that continuously or periodically detects the far end position of the optical fiber based on the optical signal received from the optical fiber; a break detection section that determines that the optical fiber is broken when a difference between the far end position detected by the far end detection section and an initial value of the far end position exceeds a predetermined value; , is provided.
  • a fiber optic sensing device includes: a communication unit that transmits pulsed light to an optical fiber and receives an optical signal from the optical fiber; a far end detection unit that continuously or periodically detects the far end position of the optical fiber based on the optical signal received from the optical fiber; a break detection section that determines that the optical fiber is broken when a difference between the far end position detected by the far end detection section and an initial value of the far end position exceeds a predetermined value; , is provided.
  • a fracture detection method includes: A fracture detection method using an optical fiber sensing device, the method comprising: a communication step of transmitting pulsed light to an optical fiber and receiving an optical signal from the optical fiber; a far end detection step of continuously or periodically detecting the far end position of the optical fiber based on the optical signal received from the optical fiber; a break detection step of determining that the optical fiber has broken when a difference between the far end position detected by the far end detection step and an initial value of the far end position exceeds a predetermined value; ,including.
  • an optical fiber sensing system an optical fiber sensing device, and a break detection method that can detect a break in an optical fiber.
  • FIG. 1 is a diagram showing a configuration example of an optical fiber sensing system according to Embodiment 1.
  • FIG. FIG. 3 is a diagram illustrating an example of the operation of the far end detection section and the breakage detection section according to the first embodiment.
  • 3 is a diagram illustrating an example of a method for detecting the far end position of an optical fiber by the far end detection unit according to the first embodiment.
  • FIG. FIG. 7 is a diagram illustrating another example of a method for detecting the far end position of an optical fiber by the far end detection unit according to the first embodiment.
  • FIG. 2 is a flow diagram illustrating an example of a schematic operation flow of the optical fiber sensing system according to the first embodiment.
  • FIG. 3 is a diagram illustrating a configuration example of an optical fiber sensing system according to a second embodiment.
  • FIG. 3 is a flowchart showing an example of a schematic operation flow of the optical fiber sensing system according to Embodiment 2.
  • FIG. 1 is a block diagram showing an example of a hardware configuration of a computer that implements an optical fiber sensing device according to Embodiments 1 and 2.
  • FIG. 1 is a block diagram showing an example of a hardware configuration of a computer that implements an optical fiber sensing device according to Embodiments 1 and 2.
  • the optical fiber sensing system according to the first embodiment includes an optical fiber 10 and an optical fiber sensing device 20.
  • the optical fiber sensing device 20 is realized by, for example, a DFOS (Distributed Fiber Optic Sensing) device, and includes a communication section 21, a far end detection section 22, and a breakage detection section 23.
  • DFOS Distributed Fiber Optic Sensing
  • the communication section 21, the far end detection section 22, and the breakage detection section 23 are not limited to being provided in the same device as shown in FIG. 1, but may be provided in separate devices.
  • the far end detection section 22 and the breakage detection section 23 may be provided on the cloud.
  • optical fiber 10 One end of the optical fiber 10 is connected to the communication section 21 of the optical fiber sensing device 20, and the other end is a free end. Further, the optical fiber 10 is laid, for example, in a region or object where an abnormality is to be detected. Further, the optical fiber 10 may be laid in the form of an optical fiber cable that is configured by covering one or more optical fibers 10.
  • the communication unit 21 transmits pulsed light to the optical fiber 10. Then, as the pulsed light is transmitted through the optical fiber 10, backscattered light is generated. The communication unit 21 receives the backscattered light from the optical fiber 10 as an optical signal.
  • the far end detection unit 22 continuously or periodically detects the far end position of the optical fiber 10 based on the optical signal received from the optical fiber 10 by the communication unit 21. Note that a method for detecting the far end position of the optical fiber 10 will be described later.
  • the break detection unit 23 holds the initial value of the far end position of the optical fiber 10.
  • the break detection unit 23 detects that the difference between the detected far end position and the initial value of the far end position exceeds a predetermined value. Determine whether or not there is. If the difference exceeds a predetermined value, the break detection section 23 determines that the optical fiber 10 has broken.
  • the above-mentioned predetermined value held by the break detection section 23 is preferably set in consideration of the detection error of the far end position detected by the far end detection section 22.
  • the specific numerical value of the above-mentioned predetermined value is assumed to be about 1 m, for example, it is not limited to this.
  • the optical fiber 10 breaks at a position 20 km from the optical fiber sensing device 20 (communication section 21) for some reason.
  • the far end detection unit 22 detects the far end position "20 km" of the optical fiber 10 by continuous or periodic detection.
  • the break detection unit 23 calculates “20 km” as the difference between the far end position “20 km” detected by the far end detection unit 22 and the initial value of the far end position “40 km”. As described above, this difference "20 km” exceeds the predetermined value, which is assumed to be set to about 1 m. Therefore, the break detection unit 23 determines that the optical fiber 10 has broken at a position 20 km from the optical fiber sensing device 20 (communication unit 21).
  • the far end detection unit 22 detects the time difference between the time when the communication unit 21 transmits the pulsed light to the optical fiber 10 and the time when the communication unit 21 receives the optical signal from the optical fiber 10. Based on this, it is possible to specify the position where the optical signal is generated (the distance of the optical fiber 10 from the optical fiber sensing device 20 (communication section 21)).
  • the far end detection unit 22 can detect the vibration generated in the optical fiber 10 and the vibration intensity of the vibration by analyzing the characteristics of the optical signal received by the communication unit 21.
  • the far end detection unit 22 acquires data as shown in FIG. 3, so-called waterfall data.
  • the waterfall data is data expressing the time course of the vibration intensity within a specified time at each distance of the optical fiber 10 from the optical fiber sensing device 20 (communication unit 21). More specifically, the waterfall data includes vibration intensities acquired at each distance of the optical fiber 10 at each sampling time (e.g., 0.24 seconds) for a specified time (e.g., 30 seconds). This is data expressed in colors.
  • the horizontal axis indicates the distance of the optical fiber 10 from the optical fiber sensing device 20 (communication section 21), and the vertical axis indicates the time course of the vibration intensity at that distance.
  • the far end detection unit 22 first acquires waterfall data as shown in FIG. 4, as in the first method.
  • the far end detection unit 22 acquires residual data (Residual_mv) by performing convolution processing on the waterfall data and displaying only the vibration intensities that are equal to or higher than the vibration intensity threshold.
  • the far end detection unit 22 calculates a vibration score (Vibration_score) at each distance of the optical fiber 10 from the optical fiber sensing device 20 (communication unit 21) based on the residual data.
  • the far end detection section 22 calculates a score of the vibration score at that distance and the vibration score at a distance adjacent to that distance. Calculate the difference (Vibration_score_diff). Note that the adjacent distance is assumed to be the distance adjacent to the optical fiber sensing device 20 (communication unit 21) side, but is not limited to this.
  • the far end detection unit 22 sequentially checks the score difference in the positive direction (right direction in the figure) from the position where the distance of the optical fiber 10 from the optical fiber sensing device 20 (communication unit 21) is 0. . Then, the far end detection unit 22 determines the position where the score difference exceeds the score difference threshold as the far end position of the optical fiber 10.
  • the communication unit 21 first transmits pulsed light to the optical fiber 10 (step S11), and Backscattered light for the light is received as an optical signal from the optical fiber 10 (step S12).
  • the far end detection unit 22 detects the far end position of the optical fiber 10 based on the optical signal received from the optical fiber 10 by the communication unit 21 (step S13). This detection may be performed using the first method or the second method described above.
  • the breakage detection unit 23 determines whether the difference between the far end position detected by the far end detection unit 22 and the initial value of the far end position exceeds a predetermined value (step S14). .
  • step S14 if the above-mentioned difference is less than or equal to the predetermined value (No in step S14), the break detection unit 23 determines that the optical fiber 10 is not broken, and returns to the process of step S11.
  • the process of step S11 is started at the next detection timing of the far end position of the optical fiber 10.
  • the present invention is not limited to this, and the transmission of the pulsed light and the reception of the optical signal are continued thereafter, and if Step S14 is No, the process may return to Step S13.
  • step S14 if the above-mentioned difference exceeds the predetermined value (Yes in step S14), the break detection unit 23 determines that the optical fiber 10 has broken (step S15), and ends the process. do.
  • the communication unit 21 transmits pulsed light to the optical fiber 10 and receives backscattered light in response to the pulsed light from the optical fiber 10 as an optical signal.
  • the far end detection unit 22 detects the far end position of the optical fiber 10 based on the optical signal.
  • the break detection unit 23 determines that the optical fiber 10 has broken when the difference between the detected far end position and the initial value of the far end position exceeds a predetermined value. Thereby, breakage of the optical fiber 10 can be detected. In particular, it is possible to detect a break even in an optical fiber 10 whose far end is a free end.
  • the optical fiber sensing system according to the second embodiment has an optical fiber sensing device 20 equipped with an alarm output section 24, as compared with the configuration of FIG. 1 of the first embodiment described above. The difference is that
  • the alarm output unit 24 outputs an alarm when the break detection unit 23 determines that the optical fiber 10 is broken.
  • the alarm output unit 24 may output an alarm by displaying a screen such as a GUI (Graphical User Interface) screen indicating that the optical fiber 10 has been broken on a display or monitor (not shown). Further, the alarm may be outputted by outputting an audio message indicating that the optical fiber 10 is broken from a speaker (not shown).
  • GUI Graphic User Interface
  • the process is terminated.
  • the breakage of the optical fiber 10 is continuously detected while updating the initial value of the far end position of the optical fiber 10.
  • the break detection section 23 sets the initial value of the far end position of the optical fiber 10 to the far end detection section, regardless of whether it is determined that the optical fiber 10 is broken.
  • the far end position is updated with the value of the far end position detected by 22.
  • the break detection unit 23 detects the detected far end position and the updated value. Based on whether the difference between the initial value of the far end position exceeds a predetermined value, it is determined whether the optical fiber 10 is broken.
  • steps S21 to S24 which are similar to steps S11 to S14 in FIG. 5 of the first embodiment described above, are performed.
  • step S24 if the difference between the far end position detected by the far end detection unit 22 and the initial value of the far end position is less than or equal to a predetermined value (No in step S24), the breakage detection unit 23 , it is determined that the optical fiber 10 is not broken, and then the initial value of the far end position of the optical fiber 10 is updated with the value of the far end position detected by the far end detection unit 22 (step S27). Thereafter, the process returns to step S21.
  • step S24 if the above-mentioned difference exceeds the predetermined value (Yes in step S24), the break detection section 23 determines that the optical fiber 10 has broken (step S25), and the alarm output section 24 outputs an alarm (step S26). Thereafter, the break detection unit 23 updates the initial value of the far end position of the optical fiber 10 in step S27, and returns to the process of step S21.
  • step S21 when the process returns to step S21, the process of step S21 is started at the next detection timing of the far end position of the optical fiber 10.
  • the present invention is not limited to this, and the transmission of the pulsed light and the reception of the optical signal are continued thereafter, and when the process of step S27 is completed, the process may return to the process of step S23.
  • the alarm output section 24 outputs an alarm when the break detection section 23 determines that the optical fiber 10 is broken. Thereby, it is possible to notify an external user (for example, an administrator who manages the optical fiber 10) that the optical fiber 10 has been broken.
  • the break detection unit 23 detects the initial value of the far end position of the optical fiber 10 using the far end detection unit 22. Update with the far end position value. After this update, when the far end position of the optical fiber 10 is detected by the far end detection unit 22, the break detection unit 23 detects the difference between the detected far end position and the updated initial value of the far end position. It is determined whether the optical fiber 10 is broken based on whether or not exceeds a predetermined value. Thereby, it is possible to continuously detect a break in the optical fiber 10.
  • the computer 90 includes a processor 91, a memory 92, a storage 93, an input/output interface (input/output I/F) 94, a communication interface (communication I/F) 95, and the like.
  • the processor 91, memory 92, storage 93, input/output interface 94, and communication interface 95 are connected by a data transmission path for mutually transmitting and receiving data.
  • the processor 91 is an arithmetic processing device such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit).
  • the memory 92 is, for example, a RAM (Random Access Memory) or a ROM (Read Only Memory).
  • the storage 93 is, for example, a storage device such as an HDD (Hard Disk Drive), an SSD (Solid State Drive), or a memory card. Further, the storage 93 may be a memory such as RAM or ROM.
  • Programs are stored in the storage 93.
  • This program includes instructions (or software code) that, when loaded into a computer, cause the computer 90 to perform one or more functions in the fiber optic sensing device 20 described above.
  • the components in the optical fiber sensing device 20 described above may be realized by the processor 91 reading and executing a program stored in the storage 93. Further, the storage and retention functions in the optical fiber sensing device 20 described above may be realized by the memory 92 or the storage 93.
  • the above-mentioned program may be stored in a non-transitory computer-readable medium or a tangible storage medium.
  • computer-readable or tangible storage media may include RAM, ROM, flash memory, SSD or other memory technology, Compact Disc (CD)-ROM, Digital Versatile Disc (DVD), Blu-ray ( trademark) disk or other optical disk storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage device.
  • the program may be transmitted on a transitory computer-readable medium or a communication medium.
  • transitory computer-readable or communication media includes electrical, optical, acoustic, or other forms of propagating signals.
  • 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 operation input from an operator, and is, for example, a keyboard, a mouse, a touch sensor, or the like.
  • the display device 941 and the input device 942 may be integrated and realized as a touch panel.
  • the sound output device 943 is a device, such as a speaker, that outputs sound corresponding to the audio data processed by the processor 91.
  • the communication interface 95 transmits and receives data to and from an external device.
  • the communication interface 95 communicates with an external device via a wired communication path or a wireless communication path.
  • optical fiber and a communication unit that transmits pulsed light to the optical fiber and receives an optical signal from the optical fiber; a far end detection unit that continuously or periodically detects the far end position of the optical fiber based on the optical signal received from the optical fiber; a break detection section that determines that the optical fiber is broken when a difference between the far end position detected by the far end detection section and an initial value of the far end position exceeds a predetermined value; , comprising; Fiber optic sensing system.
  • the break detection section updates the initial value of the far end position with the value of the far end position detected by the far end detection section after determining whether the optical fiber is broken.
  • the optical fiber sensing system described in Appendix 1. (Additional note 3) When the far end position is detected by the far end detection unit after updating the initial value of the far end position, the breakage detection unit detects the detected far end position and the updated far end position. determining whether the optical fiber is broken depending on whether the difference between the initial value and the predetermined value exceeds a predetermined value; The optical fiber sensing system described in Appendix 2.
  • the far end detection section is Based on the optical signal received from the optical fiber, for each distance of the optical fiber from the communication unit, obtain data expressing the time course of vibration intensity within a specified time at the distance, detecting a far end position of the optical fiber based on the data;
  • the far end detection section is Based on the optical signal received from the optical fiber, for each distance of the optical fiber from the communication unit, calculate a score by integrating the values of vibration intensity within a specified time at the distance, For each distance of the optical fiber from the communication unit, calculate the score difference between the score at that distance and the score at a distance adjacent to the distance, detecting the far end position of the optical fiber based on the score difference;
  • the optical fiber sensing system described in Appendix 1. (Appendix 6) further comprising an alarm output unit that outputs an alarm when the break detection unit determines that the optical fiber is broken;
  • (Appendix 7) a communication unit that transmits pulsed light to an optical fiber and receives an optical signal from the optical fiber; a far end detection unit that continuously or periodically detects the far end position of the optical fiber based on the optical signal received from the optical fiber; a break detection section that determines that the optical fiber is broken when a difference between the far end position detected by the far end detection section and an initial value of the far end position exceeds a predetermined value; , comprising; Fiber optic sensing equipment. (Appendix 8) The break detection section updates the initial value of the far end position with the value of the far end position detected by the far end detection section after determining whether the optical fiber is broken.
  • the breakage detection unit detects the detected far end position and the updated far end position. determining whether the optical fiber is broken depending on whether the difference between the initial value and the predetermined value exceeds a predetermined value;
  • the optical fiber sensing device described in Appendix 8. (Appendix 10)
  • the far end detection section is Based on the optical signal received from the optical fiber, for each distance of the optical fiber from the communication unit, obtain data expressing the time course of vibration intensity within a specified time at the distance, detecting a far end position of the optical fiber based on the data;
  • the far end detection section is Based on the optical signal received from the optical fiber, for each distance of the optical fiber from the communication unit, calculate a score by integrating the values of vibration intensity within a specified time at the distance, For each distance of the optical fiber from the communication unit, calculate the score difference between the score at that distance and the score at a distance adjacent to the distance, detecting the far end position of the optical fiber based on the score difference;
  • the optical fiber sensing device described in Appendix 7. (Appendix 12) further comprising an alarm output unit that outputs an alarm when the break detection unit determines that the optical fiber is broken;
  • a fracture detection method using an optical fiber sensing device comprising: a communication step of transmitting pulsed light to an optical fiber and receiving an optical signal from the optical fiber; a far end detection step of continuously or periodically detecting the far end position of the optical fiber based on the optical signal received from the optical fiber; a break detection step of determining that the optical fiber has broken when a difference between the far end position detected by the far end detection step and an initial value of the far end position exceeds a predetermined value; ,including, Fracture detection method.
  • the breakage detection step after determining whether or not the optical fiber is broken, the initial value of the far end position is updated with the value of the far end position detected in the far end detection step.
  • the fracture detection method described in Appendix 13. (Additional note 15) In the breakage detection step, if the far end position is detected by the far end detection step after updating the initial value of the far end position, the detected far end position and the updated far end position are determining whether the optical fiber is broken depending on whether the difference between the initial value and the predetermined value exceeds a predetermined value; The fracture detection method described in Appendix 14. (Appendix 16) In the far end detection step, Based on the optical signal received from the optical fiber, for each distance of the optical fiber from the communication unit, obtain data expressing the time course of vibration intensity within a specified time at the distance, detecting a far end position of the optical fiber based on the data; The fracture detection method described in Appendix 13.

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Abstract

Un système de détection de fibre optique selon la présente divulgation comprend : une fibre optique (10) ; une unité de communication (21) qui transmet une lumière pulsée à la fibre optique (10) et reçoit un signal optique provenant de la fibre optique (10) ; une unité de détection d'extrémité distale (22) qui détecte de manière continue ou régulière la position d'extrémité distale de la fibre optique (10) sur la base du signal optique reçu de la fibre optique (10) ; et une unité de détection de rupture (23) qui détermine que la fibre optique (10) s'est rompue si la différence entre la position d'extrémité distale détectée par l'unité de détection d'extrémité distale (22) et la valeur initiale de la position d'extrémité distale dépasse une valeur prescrite.
PCT/JP2022/034145 2022-09-13 2022-09-13 Système de détection de fibre optique, dispositif de détection de fibre optique et procédé de détection de rupture WO2024057379A1 (fr)

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JP2013138121A (ja) * 2011-12-28 2013-07-11 Hitachi High-Technologies Corp 半導体製造装置
WO2019235152A1 (fr) * 2018-06-05 2019-12-12 住友電気工業株式会社 Système d'inspection et procédé d'inspection
WO2020044659A1 (fr) * 2018-08-30 2020-03-05 日本電気株式会社 Réflectomètre temporel optique, méthode d'essai de trajet de transmission optique, et système d'essai de trajet de transmission optique
WO2020044660A1 (fr) * 2018-08-30 2020-03-05 日本電気株式会社 Système d'identification d'état, dispositif d'identification d'état, procédé d'identification d'état et support lisible par ordinateur non transitoire

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09181384A (ja) * 1995-12-25 1997-07-11 Nec Corp レーザ光出力装置
JP2004322745A (ja) * 2003-04-22 2004-11-18 Central Japan Railway Co トロリ線摩耗検出方法
JP2005017166A (ja) * 2003-06-27 2005-01-20 Sumitomo Electric Ind Ltd 光ファイバの断線測定方法
JP2008067467A (ja) * 2006-09-06 2008-03-21 Chugoku Electric Power Co Inc:The 電柱折損状況監視システム及び該電柱折損状況監視システムで使用される電柱
JP2013138121A (ja) * 2011-12-28 2013-07-11 Hitachi High-Technologies Corp 半導体製造装置
WO2019235152A1 (fr) * 2018-06-05 2019-12-12 住友電気工業株式会社 Système d'inspection et procédé d'inspection
WO2020044659A1 (fr) * 2018-08-30 2020-03-05 日本電気株式会社 Réflectomètre temporel optique, méthode d'essai de trajet de transmission optique, et système d'essai de trajet de transmission optique
WO2020044660A1 (fr) * 2018-08-30 2020-03-05 日本電気株式会社 Système d'identification d'état, dispositif d'identification d'état, procédé d'identification d'état et support lisible par ordinateur non transitoire

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