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公开(公告)号：EP4390302A1
公开(公告)日：2024-06-26
申请号：EP21954137.2
申请日：2021-08-16
摘要： The present disclosure provides an underground facility position contrast system S, which includes: a scattered light intensity distribution measurement device 1 for measuring, when an earthquake vibration is applied to an optical fiber F laid underground, a change over time in a scattered light intensity distribution in a longitudinal direction of the optical fiber F; and an underground facility position contrast device 2 for measuring a change over time in a distortion response distribution in the longitudinal direction of the optical fiber F based on the change over time in the scattered light intensity distribution in the longitudinal direction of the optical fiber F, estimating an underground facility state of the optical fiber F based on the change over time in the distortion response distribution in the longitudinal direction of the optical fiber F, and associating the underground facility position of the optical fiber F with a longitudinal distance of the optical fiber F.
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公开(公告)号：EP3920435A1
公开(公告)日：2021-12-08
申请号：EP20748563.2
申请日：2020-01-17
IPC分类号： H04B10/071
摘要： An object is to provide an optical fiber route search method, an optical fiber route search device, and a program that can efficiently confirm a path of an optical fiber that is installed over a long distance or across a large range.
The optical fiber route search method according to the present invention carries out optical measurement that performs distributed measurement of the state of an optical fiber while applying a disturbance to the optical fiber in a portion in which wires of the optical fiber are parallel to each other, branch out, or intersect with each other (a proximity portion), and determines that the position in which the number of singularities (peaks or intensity fluctuations) fluctuates (becomes plural) is the position of the proximity portion from a distribution diagram obtained through the optical measurement.-
公开(公告)号：EP4317920A1
公开(公告)日：2024-02-07
申请号：EP21933078.4
申请日：2021-03-25
IPC分类号： G01D5/353
摘要： An object of the present disclosure is to reduce measurement instrument noise without complicating a reception system nor prolonging an analysis time.
The present disclosure generates an optical spectrogram, representing a temporal change in frequency characteristics, using a plurality of spectral data measured by an OFDR measurement instrument at different times, and filters the optical spectrogram in both a time direction and a frequency direction.-
4.发明公开
公开(公告)号：EP4296633A1
公开(公告)日：2023-12-27
申请号：EP21926487.6
申请日：2021-02-17
摘要： An object of the present disclosure is to provide a method for remotely identifying a utility pole position and estimating a state of an overhead optical fiber cable.
The present disclosure is a method for identifying a utility pole position including identifying a boundary region of a vibration distribution as a utility pole position, from a vibration distribution pattern obtained by measuring strain amounts with respect to distances of an optical fiber by an optical fiber vibration distribution measuring method at each time and sequentially stacking the strain amounts.-
公开(公告)号：EP4296624A1
公开(公告)日：2023-12-27
申请号：EP21932940.6
申请日：2021-03-23
发明人： WAKISAKA, Yoshifumi , OKAMOTO, Tatsuya , IIDA, Daisuke , KOSHIKIYA, Yusuke , KIKUCHI, Masashi , HONDA, Nazuki
IPC分类号： G01D5/353
摘要： A signal processing device (19) executes a phase connection process step of performing a phase connection process on a position in a space and a phase value at each of a plurality of times, a first correction step of performing outlier correction of a phase value for each position in the space in a predetermined direction of the space at a predetermined time among the plurality of times based on a result of the phase connection process, and a second correction step of correcting a phase value at a time other than the predetermined time for each of correction target positions in the first correction step among positions in the space.
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公开(公告)号：EP4354099A1
公开(公告)日：2024-04-17
申请号：EP21945112.7
申请日：2021-06-09
IPC分类号： G01H9/00
CPC分类号： G01H9/00
摘要： The present disclosure aims to remove the influence of an uncorrected angular difference, even in a state where the multiplexing number allocated to reduction of fading noise is small and the angular difference between the respective main optical frequencies is completely uncorrectable.
The present disclosure relates to a signal processing device that: acquires a signal obtained by repeatedly injecting a plurality of light pulses with different optical frequencies into an optical fiber, and by performing distributed acoustic sensing-phase (DAS-P); calculates a phase change, caused by vibration applied to a section of the optical fiber, using the acquired signal; removes, from the calculated phase change, a component regarding a repetition period of the same optical frequency of the plurality of light pulses; and calculates the vibration applied to the section of the optical fiber, using a phase change obtained by removing the component regarding the period.-
公开(公告)号：EP4212834A1
公开(公告)日：2023-07-19
申请号：EP20953319.9
申请日：2020-09-11
IPC分类号： G01H9/00
摘要： An object is to provide a vibration detection apparatus and a vibration detection method which can avoid occurrence of a point where detection sensitivity deteriorates in vibration detection of a scattered light intensity monitor according to optical frequency multiplexing.
The present invention conceives a multi-dimensional space having as many dimensions as the number of frequencies to be used, causes scattered light intensity change at each optical frequency to correspond to each axis, plots a scattered light signal as a vector on the space, performs linear approximation passing through an origin on the space having a plurality of plotted vector points as original data, and performs vibration detection using a direction vector of an approximate straight line obtained as a result of the approximation.-
公开(公告)号：EP4354100A1
公开(公告)日：2024-04-17
申请号：EP21945113.5
申请日：2021-06-09
IPC分类号： G01H9/00
CPC分类号： G01H9/00
摘要： The present disclosure aims to reduce crosstalk between different optical frequency components, and reduce erroneous detection of vibration and distortion of a vibrational waveform.
The present disclosure relates to a vibration measuring instrument that repeatedly injects a plurality of light pulses with different optical frequencies into an optical fiber, and performs distributed acoustic sensing-phase (DAS-P). In the vibration measuring instrument, light pulses having a waveform with a spectral side lobe smaller than a side lobe of a rectangular wave are used as the plurality of light pulses.-
公开(公告)号：EP4325192A1
公开(公告)日：2024-02-21
申请号：EP21936941.0
申请日：2021-04-14
IPC分类号： G01M11/00
摘要： An object of the present invention is to provide a cable test system, an analysis apparatus, a cable test method, and a program capable of recognizing a sag section of an overhead cable without sending a worker to a site.
A cable test system according to the present invention includes an optical fiber vibration distribution measurement apparatus 11 that acquires a vibration distribution waveform of an overhead optical fiber cable 50 to be tested, the vibration distribution waveform being represented in a time domain and a distance domain in a longitudinal direction, and an analysis apparatus 12 that calculates a propagation speed of vibrations propagating through the overhead optical fiber cable 50 from the vibration distribution waveform and detects, as a cable sag section, a section of the overhead optical fiber cable 50 in which the propagation speed is equal to or lower than a threshold value.-
公开(公告)号：EP4300030A1
公开(公告)日：2024-01-03
申请号：EP21927934.6
申请日：2021-02-26
发明人： IIDA, Daisuke , ENOMOTO, Yoshitaka , KITO, Chihiro , OKAMOTO, Tatsuya , KOSHIKIYA, Yusuke , WAKISAKA, Yoshifumi , HONDA, Nazuki
IPC分类号： G01B11/00
摘要： An object of the present disclosure is to enable testing of a long-distance optical fiber line and detecting of distances to a plurality of abnormal facilities.
The present disclosure is an optical line test system that detects a distribution of loss points of an optical line in a longitudinal direction, using a coherent light measurement device, applies vibration to facility disposed on a path of the optical line, detects a vibration point of the optical line in a longitudinal direction upon applying the vibration, using the coherent light measurement device, and identifies the loss point based on correspondence between the detected loss point and vibration point.
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