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公开(公告)号：US11994376B2
公开(公告)日：2024-05-28
申请号：US17634435
申请日：2020-02-13
发明人： Tatsuya Okamoto , Daisuke Iida , Hiroyuki Oshida
IPC分类号： G01B11/16
CPC分类号： G01B11/16
摘要： The present disclosure provides a device that accurately measures vibration at a designated position of a sensing fiber without using digital signal processing to compensate for distance fluctuation. Digital signal processing for correcting fluctuation of a measurement distance due to a frequency offset of a beat signal due to vibration, which is a measurement target, is simplified. In the present disclosure, vibration at a designated position of the sensing fiber is accurately measured without using the digital signal processing to compensate for the distance fluctuation. A spectrum analysis length of an electrical field E(τn) of backscattered light is set to be larger than a delay deviation Nd due to frequency modulation caused by dynamic strain. An index of tolerance of vibration distribution measurement to the delay deviation Nd is also clarified.
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公开(公告)号：US11922650B2
公开(公告)日：2024-03-05
申请号：US17608975
申请日：2019-05-08
发明人： Hitoshi Niigaki , Masaki Waki , Masaaki Inoue , Yasuhiro Yao , Tomoya Shimizu , Hiroyuki Oshida , Kana Kurata , Shingo Ando , Atsushi Sagata
CPC分类号： G06T7/66 , G06V10/25 , G06V10/755 , G06T2207/10028
摘要： It is possible to estimate a slack level accurately in consideration of a shape of a deformed cable. A point cloud analysis device sets a plurality of regions of interest obtained by window-searching a wire model including a quadratic curve model representing a cable obtained from a point cloud consisting of three-dimensional points on an object, the region of interest being divided into a first region and a second region. The point cloud analysis device compares information on the first region with information on the second region based on the point cloud included in the region of interest and the quadratic curve model for each of the plurality of regions of interest, calculates a degree of division boundary representing a degree to which a division position between the first region and the second region of the plurality of regions of interest is a branch point of the cable, and detects a division boundary point that is a branch point of a cable represented by the quadratic curve model based on the degree of division boundary calculated for each of the plurality of regions of interest.
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公开(公告)号：US12031858B2
公开(公告)日：2024-07-09
申请号：US17429861
申请日：2020-01-29
发明人： Tatsuya Okamoto , Daisuke Iida , Hiroyuki Oshida
IPC分类号： G01H9/00 , G01M11/00 , H04B10/071
CPC分类号： G01H9/004 , G01M11/30 , H04B10/071
摘要： It is an object of the present invention to provide an aerial optical fiber cable inspection method, an aerial optical fiber cable inspection device, and a program which can identify a cable sagging section from vibration sensing results. In the aerial optical fiber cable inspection method according to the present invention, a vibration distribution waveform along the longitudinal direction of an aerial optical fiber cable measured using an optical fiber vibration sensing device is received as an input, a standard deviation of the amplitude of vibration at each position in the vibration distribution waveform is calculated, and a section with a standard deviation larger than that of other sections is identified as a cable sagging section.
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公开(公告)号：US11948319B2
公开(公告)日：2024-04-02
申请号：US17437887
申请日：2020-03-18
发明人： Masaaki Inoue , Tomoya Shimizu , Ryuji Honda , Hiroyuki Oshida
摘要： A structure detection device according to an embodiment includes: a reading processing unit that reads, as three-dimensional point group data on an object present in a three-dimensional space, data including three-dimensional position information and color information at a point on a surface of the object; a filtering processing unit that performs filtering processing for extracting three-dimensional point group data on a detection-target structure from the three-dimensional point group data on the object present in the three-dimensional space based on the color information; and a generation processing unit that generates three-dimensional model data in which the detection-target structure is represented as a three-dimensional model based on the three-dimensional point group data on the detection-target structure, the three-dimensional point group data being extracted by the filtering processing unit.
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公开(公告)号：US11644347B2
公开(公告)日：2023-05-09
申请号：US17275327
申请日：2019-09-12
发明人： Tatsuya Okamoto , Daisuke Iida , Hiroyuki Oshida , Tetsuya Manabe
CPC分类号： G01D5/35306 , E02D29/14 , G01D5/35358 , G01H9/004
摘要： A manhole position identification method of the present invention includes: measuring, from an end of an optical fiber, a temporal variation in scattering light from the optical fiber when an impact blow is applied to a cover of a manhole located on a path of the optical fiber, so as to obtain temporal variations in a scattering light intensity distribution in a longitudinal direction of the optical fiber; determining an occurrence of vibration due to the impact blow based on the temporal variations at positions in the scattering light intensity distribution, so as to identify an impact blow position on the optical fiber; and associating the impact blow position on the optical fiber with a map position of the manhole whose cover has received the impact blow, so as to identify a position of the manhole expressed in terms of optical fiber length from the end.
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公开(公告)号：US11598692B2
公开(公告)日：2023-03-07
申请号：US17413880
申请日：2019-12-03
发明人： Atsushi Nakamura , Keiji Okamoto , Hiroyuki Oshida
IPC分类号： G01M11/00
摘要： An object is to provide an optical pulse test method and an optical pulse test device with which it is possible to measure transmission losses of a basic mode and a first higher-order mode at a connection point at which two-mode optical fibers are connected in series, without switching the mode of input test light.
An optical pulse test device according to the present invention inputs a test optical pulse in a basic mode (or a first higher-order mode) from one end of an optical fiber under test, the test optical pulse having such a wavelength that the test optical pulse can propagate in the basic mode and the first higher-order mode, measures intensity distributions of a basic mode component and a first higher-order mode component of return light of the test optical pulse relative to the distance from the one end, finds, from the intensity distributions, losses of the basic mode component and the first higher-order mode component of the return light at a desired connection point of the optical fiber under test, and calculates transmission losses of the basic mode and the first higher-order mode at the connection point based on expressions (8) (or expressions (9)).-
公开(公告)号：US11463163B2
公开(公告)日：2022-10-04
申请号：US17430016
申请日：2020-01-29
发明人： Tatsuya Okamoto , Daisuke Iida , Hiroyuki Oshida
IPC分类号： H04B10/07 , H04B10/071 , H04B10/2507 , G01M11/00 , H04B10/61 , H04B10/63 , H04B10/64
摘要： The purpose of the present invention is to provide a device for optical frequency domain reflectometry and a method thereof that can measure a reflectance distribution with less spatial resolution degradation due to a phase noise, without using a wideband receiving system even when a long-distance measurement is performed. The device for optical frequency domain reflectometry according to the present invention is provided with a delay optical fiber for delaying a local light by a prescribed time, and obtains information on a relative delay of a backscattered light from an optical fiber under measurement with respect to the local light and information on the positivity and the negativity of a beat frequency by measuring an in-phase component and a quadrature component of a beat signal obtained by multiplexing the backscattered light from the optical fiber under measurement and the local light delayed by the delay optical fiber, so as to obtain a reflectance distribution in a longitudinal direction of the optical fiber under measurement based on these pieces of information.
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公开(公告)号：US11965758B2
公开(公告)日：2024-04-23
申请号：US17923263
申请日：2020-05-21
IPC分类号： G01D5/353
CPC分类号： G01D5/35364
摘要： An object of the present invention is to provide a Brillouin optical sensing device and an optical sensing method capable of reducing introduction costs. The Brillouin optical sensing device according to the present invention includes: a sensing fiber 90 in which a plurality of optical fibers having Brillouin frequency shift characteristics different from each other are arranged in parallel; an optical measuring instrument 11 that launches an optical pulse into at least two of the optical fibers of the sensing fiber 90 to generate Brillouin scattering lights and measures a beat frequency of a beat signal between the Brillouin scattering lights at any position of the sensing fiber 90; and an arithmetic processing unit 12 that acquires a physical quantity of the sensing fiber 90 at said any position based on the beat frequency acquired by the optical measuring instrument 11.
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公开(公告)号：US11828676B2
公开(公告)日：2023-11-28
申请号：US17596368
申请日：2019-06-11
发明人： Atsushi Nakamura , Keiji Okamoto , Hiroyuki Oshida
IPC分类号： G01M11/00
CPC分类号： G01M11/3145 , G01M11/3154
摘要： The purpose of this invention is to provide an optical pulse testing method and optical pulse testing device capable of measuring the loss at an end farther than an axially misaligned connection point at which inter-mode crosstalk occurs independently from the crosstalk value at the point. In this optical pulse testing method, a matrix (loss and crosstalk) representing the mode coupling at a near-end connection point is calculated, and an OTDR waveform having the effects of crosstalk eliminated therefrom is obtained by numerical processing using the calculated matrix representing the mode coupling.
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公开(公告)号：US11823330B2
公开(公告)日：2023-11-21
申请号：US17634595
申请日：2019-08-19
发明人： Masaaki Inoue , Hitoshi Niigaki , Yukihiro Goto , Shigehiro Matsuda , Toshiya Ohira , Ryuji Honda , Tomoya Shimizu , Hiroyuki Oshida
CPC分类号： G06T17/20 , G01B11/002 , G06F30/18
摘要： An object of the present disclosure is to provide a technique for creating a three-dimensional model of a line-like structure from a point cloud obtained using three-dimensional laser measuring equipment and detecting a three-dimensional model of a cable. A detection apparatus according to the disclosure includes a point cloud data input unit 12 that reads point cloud data where a structure that is present in a three-dimensional space is represented by a point cloud that is present in the three-dimensional space, a rule-based three-dimensional model generation unit 15 that combines linearly disposed point clouds into a group and generates a three-dimensional model of a line-like structure using a direction vector configured with point clouds included in the group, a machine learning-based three-dimensional model generation unit 14 that generates a three-dimensional model of a line-like structure based on a database that links point clouds and line-like structures, and a three-dimensional model merging unit that selects one of a plurality of three-dimensional models of line-like structures generated at an identical position in the three-dimensional space as a three-dimensional model of a line-like structure that is present in the three-dimensional space and merges three-dimensional models of the line-like structures that are present in the three-dimensional space.
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