公开(公告)号：US20230010341A1

公开(公告)日：2023-01-12

申请号：US17781446

申请日：2020-12-09

Applicant: NEC Corporation

Inventor： Yukihide YODA ,  Naoto OGURA ,  Yoshiaki AONO

IPC: G01H9/00

Abstract: In order to provide a detection device that is capable of detecting the submersion of a fiber-optic cable in water before water penetrates the interior of the fiber-optic cable, a detection system 1 comprises: a vibration-detecting fiber-optic cable 20; a receiving means 11 that receives an optical signal including vibrations detected by the fiber-optic cable 20; and a detection means 12 that detects submersion of the fiber-optic cable in water on the basis of the vibrations included in the optical signal.

公开(公告)号：US20210372828A1

公开(公告)日：2021-12-02

申请号：US17291041

申请日：2019-10-16

Applicant: NEC Corporation

Inventor： Yukihide YODA ,  Yoshiaki AONO

IPC: G01D5/353

Abstract: A civil engineering structure monitoring system according to the present disclosure is provided with: a cable (20) including communication optical fibers and laid in a civil engineering structure (10); a reception unit (331) configured to receive, from at least one of the communication optical fibers included in the cable (20), an optical signal including a pattern corresponding to a deteriorated state of the civil engineering structure (10); and a detection unit (332) configured to detect the deteriorated state of the civil engineering structure (10) based on the pattern.

公开(公告)号：US20210247215A1

公开(公告)日：2021-08-12

申请号：US17270333

申请日：2019-04-23

Applicant: NEC Corporation

Inventor： Yukihide YODA ,  Yoshiaki AONO ,  Koji ASAHI

IPC: G01D5/353 ,  G01N21/952

Abstract: A utility pole deterioration detection system includes a cable (20) disposed in a utility pole (10), the cable (20) containing a communication optical fiber, a receiving unit (331) configured to receive an optical signal containing a pattern that changes according to a deterioration state of the utility pole (10) from at least one optical fiber contained in the cable (20), and a detection unit (332) configured to detect a deterioration state of the utility pole (10) based on the pattern.

公开(公告)号：US20230081172A1

公开(公告)日：2023-03-16

申请号：US17801589

申请日：2021-01-18

Applicant: NEC Corporation

Inventor： Yukihide YODA ,  Naoto OGURA ,  Yoshiaki AONO

IPC: H02J13/00 ,  G01D5/353

Abstract: A power failure detection system according to the present disclosure includes an optical fiber (10) configured to detect a state of a transformer (40), a reception unit (201) configured to receive an optical signal including information indicating the state of the transformer (40), from the optical fiber (10), and a detection unit (202) configured to detect occurrence of a power failure, based on information indicating the state of the transformer (40), the information being included in the optical signal.

公开(公告)号：US20220277641A1

公开(公告)日：2022-09-01

申请号：US17632848

申请日：2020-07-21

Applicant: NEC Corporation

Inventor： Yukihide YODA ,  Naoto OGURA ,  Yoshiaki AONO

IPC: G08B25/00 ,  G01H9/00 ,  H04R23/00 ,  G10L15/22

Abstract: An optical fiber sensing system according to the present disclosure comprises an optical fiber (10), a reception unit (21) configured to receive, from the optical fiber (10), an optical signal including a vibration pattern, and a detection unit (22) configured to detect occurrence of a rescue request based on the vibration pattern included in the optical signal.

公开(公告)号：US20220032981A1

公开(公告)日：2022-02-03

申请号：US17298787

申请日：2019-10-16

Applicant: NEC Corporation

Inventor： Yukihide YODA ,  Yoshiaki AONO

IPC: B61L23/04 ,  B61L23/34 ,  G01D5/26

Abstract: A railroad monitoring system according to the present disclosure includes a cable (20) including a communication optical fiber being laid on a railroad (10), a reception unit (331) configured to receive an optical signal from at least one communication optical fiber included in the cable (20), and a detection unit (332) configured to detect a pattern according to a state of the railroad (10), based on the optical signal, and detect an abnormal state of the railroad (10), based on the detected pattern according to the state of the railroad (10).

公开(公告)号：US20210285798A1

公开(公告)日：2021-09-16

申请号：US16818184

申请日：2020-03-13

Applicant: NEC Corporation

Inventor： Naoto OGURA ,  Yukihide YODA ,  Koyo MORI

IPC: G01D5/26 ,  G08B21/18

Abstract: A method of detecting removal of a maintenance hatch includes transmitting an optical pulse along an optical fiber, wherein a first portion of the optical fiber is proximate to the maintenance hatch. The method further includes detecting backscatter light from the optical fiber using a sensor. The method further includes determining information related to the first portion of the optical fiber based on a comparison of the detected backscatter light and a trained model. The method further includes identifying whether the maintenance hatch has been removed based on the determined information.

公开(公告)号：US20240271972A1

公开(公告)日：2024-08-15

申请号：US18566757

申请日：2021-06-08

Applicant: NEC Corporation

Inventor： Yukihide YODA ,  Koyo MORI ,  Tadayuki IWANO

IPC: G01D5/353 ,  G01H9/00 ,  G01M10/00 ,  H04N23/66

CPC classification number: G01D5/35374 ,  G01D5/35354 ,  G01H9/004 ,  G01M10/00 ,  H04N23/66

Abstract: A detection system according to the present disclosure includes: an optical fiber (30) embedded in or near an embankment (20) of a river (10); a communication unit (41) that receives, from the optical fiber (30), an optical signal including a pattern indicating that the optical fiber (30) is exposed; and detection unit (51) that detects breakage of the embankment (20) based on the pattern.

公开(公告)号：US20230384141A1

公开(公告)日：2023-11-30

申请号：US18032138

申请日：2020-10-28

Applicant: NEC Corporation

Inventor： Yukihide YODA ,  Koyo Mori ,  Tadsyuki Iwano

IPC: G01F23/14 ,  H04N23/661 ,  H04N7/22 ,  G08C23/06 ,  G01F23/22 ,  G01N21/95 ,  E02B3/04

CPC classification number: G01F23/14 ,  H04N23/661 ,  H04N7/22 ,  G08C23/06 ,  G01F23/22 ,  G01N21/95 ,  E02B3/04

Abstract: A specifying system according to the present disclosure includes an optical fiber (30) laid along a levee (20) of a river (10), a communication unit (41) configured to receive, from the optical fiber (30), an optical signal containing a pattern that changes according to a state of the levee (20), and a specifying unit (51) configured to specify a water level of the river (10) based on the pattern that changes according to the state of the levee (20).

公开(公告)号：US20230078369A1

公开(公告)日：2023-03-16

申请号：US17802260

申请日：2021-03-25

Applicant: NEC Corporation

Inventor： Yukihide YODA ,  Naoto OGURA ,  Yoshiaki AONO

IPC: G01L5/105 ,  G01L1/24 ,  G01N21/47

Abstract: An identification system (1) includes a transmitter (131) for transmitting pulsed light via an optical fiber (10); a receiver (132) for receiving backscattering light of the pulsed light from the optical fiber (10); a detector (133) for detecting, from the backscattering light, the condition of environment surrounding the optical fiber (10); and an identifier (320) for identifying sagging of the optical fiber (10) from a detection result by the detector (133).