公开(公告)号：WO2021207102A1

公开(公告)日：2021-10-14

申请号：PCT/US2021/025823

申请日：2021-04-05

Applicant: NEC LABORATORIES AMERICA, INC.

Inventor： HUANG, Ming-Fang ,  WANG, Ting ,  HAN, Shaobo

IPC: G01H9/00 ,  G01V8/16 ,  G01V1/50 ,  E21B47/12

Abstract: Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that advantageously identify location(s) of construction - or other activities - taking place along fiber optic cable routes that can damage the fiber optic cables.

公开(公告)号：WO2023091536A1

公开(公告)日：2023-05-25

申请号：PCT/US2022/050185

申请日：2022-11-17

Applicant: NEC LABORATORIES AMERICA, INC.

Inventor： HAN, Shaobo ,  HUANG, Ming-Fang ,  CHEN, Yuheng

IPC: G01H9/00 ,  G01D5/353 ,  H02G9/02

Abstract: Disclosed are buried cable protection systems and methods that employ impulse signal detection by optical fiber sensing technologies, and which provide such protection automatically and in real-time. The methods theoretically model a time difference of arrival (TDoA) of an impulse wave travelling to a DFOS sensor fiber cable. A model employing a set of propagation relationships that account for vague knowledge about wave propagation speed and threat range(s) is fitted with parameters based on a numerical simulation - without specific knowledge of a source of vibration. As compared to vibration magnitude information, time of arrival (ToA) information is more consistent and less sensitive to ambiguities and inaccuracies. In addition, the model parameter can be adjusted adaptively when temporal resolution of the sensor changes or fluctuates. As a result, our inventive systems and methods effectively detect impulse signals from machines or other activities generating vibratory impulse ground events at different distances to a fiber optic cable and distinguish same from background noises including those caused by transportation modes such as train or vehicular traffic.

公开(公告)号：WO2023004182A1

公开(公告)日：2023-01-26

申请号：PCT/US2022/038106

申请日：2022-07-23

Applicant: NEC LABORATORIES AMERICA, INC.

Inventor： HUANG, Ming-Fang ,  HAN, Shaobo ,  WANG, Ting ,  CHEN, Yuheng ,  DING, Yangmin ,  TIAN, Yue ,  OZHARAR, Sarper

IPC: G01V1/30 ,  G01V1/22

Abstract: Systems and methods for determining fiber optic facility (cable) location using distributed fiber optic sensing (DFOS) and sequence pattern matching of vibration excitation signals applied to a sensor fiber. The use of sequence pattern matching with unique pattern codes allow for the precise determination of location and length of deployed fiber cable while exhibiting an immunity from environmental vibrations proximate to the fiber. As a result improved measurements are realized and false alarms are eliminated.

公开(公告)号：WO2022140486A1

公开(公告)日：2022-06-30

申请号：PCT/US2021/064754

申请日：2021-12-21

Applicant: NEC LABORATORIES AMERICA, INC.

Inventor： HAN, Shaobo ,  CHEN, Yuheng ,  HUANG, Ming-Fang ,  LI, Tingfeng

IPC: G01H9/00 ,  G01D5/353 ,  G06N3/04 ,  G06N20/00 ,  G08G1/04 ,  B60W2420/406 ,  B60W30/18 ,  G01H9/004 ,  G06V10/14 ,  G06V10/764 ,  G06V10/82 ,  G06V20/44 ,  G06V20/52 ,  G06V2201/08 ,  H04B10/2537

Abstract: A fiber optic sensing technology for vehicle run-off-road incident automatic detection by an indicator of sonic alert pattern (SNAP) vibration patterns. A machine learning method is employed and trained and evaluated against a variety of heterogeneous factors using controlled experiments, demonstrating applicability for future field deployment. Extracted events resulting from operation of our system may be advantageously incorporated into existing management systems for intelligent transportation and smart city applications, facilitating real-time alleviation of traffic congestion and/or providing a quick response rescue and clearance operation

公开(公告)号：WO2022087012A1

公开(公告)日：2022-04-28

申请号：PCT/US2021/055675

申请日：2021-10-19

Applicant: NEC LABORATORIES AMERICA, INC.

Inventor： TIAN, Yue ,  HAN, Shaobo ,  OZHAHAR, Sarper ,  DING, Yangmin ,  LU, You

IPC: G01H9/00 ,  G01D5/353 ,  H02G7/00

Abstract: Aspects of the present disclosure describe the localization of a utility pole by distributed fiber sensing of aerial fiber cable suspended from the utility pole

公开(公告)号：WO2022046951A1

公开(公告)日：2022-03-03

申请号：PCT/US2021/047623

申请日：2021-08-25

Applicant: NEC LABORATORIES AMERICA, INC.

Inventor： HAN, Shaobo ,  HUANG, Ming-Fang ,  CHEN, Yuheng ,  SALEMI, Milad ,  WANG, Ting ,  AONO, Yoshiaki ,  XIA, Tiejun ,  WELLBROCK, Glenn

IPC: G01H9/00 ,  G01D5/353 ,  G01N29/24

Abstract: Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that advantageously enable anomaly detection resulting from construction or other activity based on image processing that may advantageously detect / notify / prevent damage to a fiber optic network infrastructure before such damage occurs.

公开(公告)号：WO2022046949A1

公开(公告)日：2022-03-03

申请号：PCT/US2021/047621

申请日：2021-08-25

Applicant: NEC LABORATORIES AMERICA, INC.

Inventor： OZHAHAR, Sarper ,  TIAN, Yue ,  HAN, Shaobo ,  DING, Yangmin ,  WANG, Ting

IPC: G01H9/00 ,  G01V8/16 ,  G01D5/353 ,  G02B6/02

Abstract: Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that advantageously enable city-scale acoustic impulse detection and localization using standard, live aerial telecommunications optical fiber cables through the use of distributed acoustic sensing exhibiting an error of less than 1.22m.