公开(公告)号：US20220397431A1

公开(公告)日：2022-12-15

申请号：US17771891

申请日：2020-10-12

申请人： NEC Corporation

发明人： Yutaka YANO

IPC分类号： G01D5/353 ,  G01H9/00

摘要： 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.

公开(公告)号：US20220373417A1

公开(公告)日：2022-11-24

申请号：US17767213

申请日：2020-08-25

申请人： NEC Corporation

发明人： Yutaka YANO ,  Eitaro MISUMI

IPC分类号： G01L11/02

摘要： 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.

公开(公告)号：US20240085180A1

公开(公告)日：2024-03-14

申请号：US17767509

申请日：2020-08-20

申请人： NEC Corporation

发明人： Yutaka YANO ,  Eitaro MISUMI

IPC分类号： G01C13/00

CPC分类号： G01C13/004

摘要： An optical fiber sensing system according to the present disclosure includes: an optical fiber (11) configured to sense water pressure change caused by an event that has occurred in an observation region, the optical fiber being disposed in water; a reception unit (20) configured to receive a light signal from the optical fiber (11); and an identification unit (30) configured to detect distribution of water pressure and time fluctuation of water pressure in the observation region based on a pattern of the light signal, and to identify an event that has occurred in the observation region based on the detection result.

公开(公告)号：US20230341291A1

公开(公告)日：2023-10-26

申请号：US18010329

申请日：2021-06-16

申请人： NEC Corporation

发明人： Yutaka YANO ,  Hiroshi KAWAKAMI ,  Makoto SAITOH

IPC分类号： G01H9/00 ,  G01M11/00

CPC分类号： G01M11/3109 ,  G01H9/004

摘要： To suppress expansion of damage to a working-state cable due to work being continued without detecting breakage of the working-state cable when the breakage occurs, the working-state cable protection monitoring system is provided with: a working means that moves or installs a wire cable-shaped construction material including an optical fiber having at least one core; an interrogator that acquires environment information about each position of the construction material, sensed by the optical fiber; and an abnormal event detection means that, when the environment information acquired at each position of the construction material satisfies an abnormal pattern, detects an abnormal event at the position, where in the working means stops movement and installment of the wire cable-shaped construction material when the abnormal event has been detected.

公开(公告)号：US20230073833A1

公开(公告)日：2023-03-09

申请号：US17795966

申请日：2021-01-19

申请人： NEC Corporation

发明人： Yutaka YANO ,  Eitaro Misumi

IPC分类号： G01L1/24 ,  G01L11/02

摘要： A water pressure fluctuation measuring system detects a water pressure fluctuation. A cable, which includes an optical fiber, is provided on or in the ground of the seabed in such a way that the optical fiber is expanded and contracted according to the water pressure fluctuation. An optical output unit outputs 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 reflection light reflected by the partial reflection unit. A calculation unit measures a length of the optical fiber to the partial reflection unit, based on a round-trip propagation time of the received reflection light, and monitors a change of the length over time.

公开(公告)号：US20220397451A1

公开(公告)日：2022-12-15

申请号：US17770713

申请日：2020-09-14

申请人： NEC Corporation

发明人： Yutaka YANO ,  Eitaro MISUMI ,  Jun MURAMATSU

IPC分类号： G01H9/00 ,  H04R23/00

摘要： An acoustic sensor that uses an optical fiber and has a high directivity is provided. An acoustic sensor includes a sensing part and an interrogator. The sensing part has a sensing element composed of an optical fiber. The interrogator is connected to the sensing part, sends a pulse light P to the sensing part, and detects an acoustic wave sensed by the sensing part based on a reflected return light from the sensing part. The sensing element is composed of the optical fiber folded in such a way that it reciprocates a plurality of number of times along a directivity direction in which directional sensitivity is exhibited.

公开(公告)号：US20230304851A1

公开(公告)日：2023-09-28

申请号：US18019161

申请日：2021-06-29

申请人： NEC Corporation

发明人： Yutaka YANO

IPC分类号： G01H9/00 ,  H04R23/00

CPC分类号： G01H9/004 ,  H04R23/008

摘要： In, for example, the overly vast ocean, it would be economically impossible to use common sensors to construct a sensor network for capturing a rare phenomenon. This invention addresses the problem of providing an unconfirmed sound extraction device, and the like, for facilitating the monitoring of sound caused by an infrequently occurring phenomenon. This unconfirmed sound extraction device comprises an unconfirmed sound extraction unit for extracting, from sound data that has been acquired using an optical fiber and is related to sound at various positions on the optical fiber, unconfirmed sound information representing unconfirmed sound data, which is of the sound data and is on a sound having a cause that cannot be estimated, at a sound data acquisition time and location, and an output unit for outputting the unconfirmed sound information.

公开(公告)号：US20220399938A1

公开(公告)日：2022-12-15

申请号：US17778907

申请日：2020-09-14

申请人： NEC Corporation

发明人： Yutaka YANO ,  Makoto SAITOH

IPC分类号： H04B10/077 ,  G01D5/353

摘要： According to the present example embodiment, the optical fiber sensing system is an optical fiber sensing system being acquired by adding a function of optical fiber sensing to a cable of an optical communication cable system. The optical communication cable system includes the cable including an optical fiber core wire that propagates an optical signal for communication, and a plurality of devices. A function of the optical fiber sensing is a function of, by an interrogator, sending probe light to an optical fiber core wire, detecting backscattered light of the probe light, and performing sensing on environmental information around the cable. The device includes an optical wiring line through which sensing light passes without passing through an optical amplifier.

公开(公告)号：US20220170765A1

公开(公告)日：2022-06-02

申请号：US17599767

申请日：2020-03-19

申请人： NEC Corporation

发明人： Yutaka YANO ,  Eitaro MISUMI

IPC分类号： G01D5/353 ,  H04B10/071 ,  G01B11/16 ,  G01V8/16

摘要： 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.

公开(公告)号：US20230296426A1

公开(公告)日：2023-09-21

申请号：US18019143

申请日：2021-06-29

申请人： NEC Corporation

发明人： Yutaka YANO

IPC分类号： G01H9/00 ,  H04R23/00

CPC分类号： G01H9/004 ,  H04R23/008

摘要： In order to facilitate the disposition of multiple noise measuring points in a distributed manner, this underwater noise monitoring device is provide with: a processing unit in which, by using data which was acquired using optical fibers installed underwater or on a bottom of water and which indicates noise or vibration at the position of each of the optical fibers, a statistical value of the amount of noise or vibration is derived at the time and the place when/where the data was acquired; and an output unit that outputs the statistical value.