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公开(公告)号：US12298177B2
公开(公告)日：2025-05-13
申请号：US17780113
申请日：2020-09-07
Applicant: NEC Corporation
Inventor： Yutaka Yano
IPC: H04B10/077 , G01D5/353 , G01H9/00 , H01S3/30 , H04J14/02
Abstract: An optical fiber sensing system is acquired by adding an optical fiber sensing function to an optical communication cable system, and the optical fiber sensing is performed by an interrogator by sending probe light to an optical fiber, detecting backscattered light of the probe light, and performing sensing on environmental information around the optical fiber. A first sensing device installed at a remote place different from a terminal station of the optical communication cable system includes the interrogator, a power source unit configured to receive power via the optical communication cable system and supply power into the device, and a communication unit configured to communicate with a second sensing device. The interrogator generates sensing data at each point on the optical fiber by performing sensing on environmental information around the optical fiber being connected to the first sensing device.
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公开(公告)号：US12235139B2
公开(公告)日：2025-02-25
申请号：US17771891
申请日：2020-10-12
Applicant: NEC Corporation
Inventor： Yutaka Yano
Abstract: To apply an optical amplification repeater device to optical fiber sensing to lengthen a sensing range, as well as to enable compatibility with an optical communication system a cable system that uses a cable for optical fiber communication and optical fiber sensing of an environment surrounding the cable, wherein: the optical fiber communication is bidirectional communication using optical fiber pairs which are pairs of the optical fiber; in an optical fiber, a first wavelength band and a second wavelength band are different from each other; an optical amplification unit included in the optical amplification repeater device includes a first amplifier and a second amplifier that amplify rays of light in mutually opposing directions; and each of the communication optical signal, the probe light, and the backscattering light is amplified by at least either the first amplifier or the second amplifier.
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公开(公告)号：US11920962B2
公开(公告)日：2024-03-05
申请号：US17599767
申请日：2020-03-19
Applicant: NEC Corporation
Inventor： Yutaka Yano , Eitaro Misumi
IPC: G01D5/353 , G01B11/16 , G01V8/16 , H04B10/071
CPC classification number: G01D5/35354 , G01B11/16 , G01V8/16 , H04B10/071
Abstract: A slight movement of the ground is detected. A cable, which includes an optical fiber, is provided to have friction with the ground in such a way that the optical fiber is expanded and contracted in accordance with the movement of the ground. An optical output unit outputs a monitoring light to the optical fiber. A partial reflection unit is provided on a path of the optical fiber in the cable and partially reflects the monitoring light. An optical reception unit receives a reflection light reflected by the partial reflection unit. A calculation unit measures the length of the optical fiber to the partial reflection unit based on a round-trip propagation time of the reflection light that has been received and monitors its changes over time.
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4.发明公开公开(公告)号：US20230326309A1
公开(公告)日：2023-10-12
申请号：US18025268
申请日：2021-07-14
Applicant: NEC Corporation
Inventor： Yutaka Yano , Eitaro Misumi , Kenichi Nomura , Makoto Ogawa , Jun Muramatsu , Masaki Nakano
CPC classification number: G08B13/1672 , G01H9/004
Abstract: In order to facilitate fixed-point monitoring over a wide area and for a long time, this water area monitoring device comprises: a detection unit for information, such as water area intrusion, which detects, from sound data that is acquired by means of optical fibers installed in the water or the water bottom and is data pertaining to a sound or a vibration at the respective positions of the optical fibers, at least any one among sounds of water area intrusion or the like that indicate intrusion into a target water area or water area intrusion or the like, which is a prescribed behavior in the target water area, at a time at which sound data is acquired, and changes in sounds or vibrations not caused by the water area intrusion or the like; and an output unit which outputs information indicating the sound such as water area intrusion.
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公开(公告)号：US11982582B2
公开(公告)日：2024-05-14
申请号：US17767213
申请日：2020-08-25
Applicant: NEC Corporation
Inventor： Yutaka Yano , Eitaro Misumi
IPC: G01L11/02
CPC classification number: G01L11/02
Abstract: An optical fiber cable (10) according to each of the present disclosures includes a long tube (11) and at least one optical fiber (12) held and passed through an inside of the tube (11). The tube (11) expands and contracts in a longitudinal direction when water pressure on an outside of the tube (11) changes. When the tube (11) expands and contracts in the longitudinal direction, the expansion and contraction of the tube (11) in the longitudinal direction is transmitted to the optical fiber (12) to expand and contract the optical fiber (12) in the longitudinal direction.
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Patent Agency Ranking
公开(公告)号：US11927463B2
公开(公告)日：2024-03-12
申请号：US17777665
申请日：2020-08-25
Applicant: NEC Corporation
Inventor： Yutaka Yano , Eitaro Misumi , Makoto Saitoh
CPC classification number: G01D5/35358 , G01F1/3209 , G01F1/661 , G01H9/004
Abstract: A measurement system, a measurement device, and a measurement method being able to measure a flow speed for each position of an optical fiber are provided. According to one example embodiment, a measurement system includes: an object provided in a fluid, and generating a self-excited vibration by the fluid; an optical fiber provided in the fluid, and detecting the vibration; a light source outputting light P to the optical fiber; an acquisition unit acquiring backscattered light generated from the light P in the optical fiber and including a pattern indicating the vibration in a vibration position on the optical fiber to which the vibration of the fluid is transmitted; and a measurement unit measuring, from a pattern included in the backscattered light and indicating the vibration, a flow speed of the fluid in the vibration position.
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公开(公告)号：US12301295B2
公开(公告)日：2025-05-13
申请号：US18022932
申请日：2021-09-27
Applicant: NEC Corporation
Inventor： Yutaka Yano , Yoshihisa Inada , Takehiro Nakano , Ryuji Aida
IPC: H04B10/524 , H04B10/071 , H04B10/077 , H04J14/02 , H04J14/08
Abstract: In order to avoid the phenomenon of communication being impeded and signals transmitted by the plurality of slave devices overlapping, a communication system according to the present invention has the first master device transmits a first pulsed light to the first transmission path and receives a return light of the first pulsed light from the second transmission path; each of the slave devices modulates the first pulsed light, and outputs the modulated first pulsed light as the return light of the first pulsed light; and the width of the first pulsed light is narrower than double the shortest distance from among the transmission distance between the slave device outputting the return light and the transmission distance between the first master device and the slave device outputting the return light.
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8.发明公开公开(公告)号：US20240142647A1
公开(公告)日：2024-05-02
申请号：US18280196
申请日：2021-03-05
Applicant: NEC Corporation
Inventor： Yutaka Yano
Abstract: An environment information acquisition apparatus (400) according to the present disclosure includes an information acquisition unit (410) configured to receive, from an optical fiber (500), an optical signal including a pattern in accordance with environment information applied to the optical fiber (500) and acquire the environment information based on the optical signal; an information provision unit (430) configured to output measurement data representing the environment information to outside; and a detection unit (420) configured to detect vibration or sound applied to the information acquisition unit (410).
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公开(公告)号：US11802790B2
公开(公告)日：2023-10-31
申请号：US17617405
申请日：2020-01-21
Applicant: NEC Corporation
Inventor： Yutaka Yano , Eitaro Misumi
CPC classification number: G01H9/004 , G02B6/443 , G02B6/4405 , G02B6/44384
Abstract: An optical fiber cable for sound wave sensing that uses a straight optical fiber and is capable of suppressing directivity is provided. The optical fiber cable for sound wave sensing includes a cover part (10) that is capable of covering a straight cable core (11) and is provided with a sound wave refraction part (12) which refracts sound waves made incident roughly perpendicularly to a longitudinal direction of the cable core (11) and makes the sound waves be incident diagonally to the longitudinal direction of the cable core (11). The cover part (10) includes a gap filling part (23) which covers the sound wave refraction part (12).
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公开(公告)号：US20230296473A1
公开(公告)日：2023-09-21
申请号：US18021339
申请日：2021-08-24
Applicant: NEC Corporation
Inventor： Yutaka Yano , Hiroshi Kawakami , Makoto Saitoh
IPC: G01M11/08
CPC classification number: G01M11/085
Abstract: In order to provide a mechanism which predicts a risk of future failure occurrence, by using fiber optic sensing, this failure prediction system comprises: a sensing function unit which acquires the environmental information detected by the optical fiber; an event classification function unit which classifies, by type, events occurring at each position of the object indicated by the environmental information, on the basis of event classification conditions; and a failure occurrence risk calculation unit having, in advance, one or more failure models obtained by modeling a physical mechanism that leads to a malfunction in the object, wherein the failure occurrence risk calculation unit calculates a failure occurrence risk in each object by the mechanism, and outputs the accumulated result as a risk or availability.
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