公开(公告)号：WO2022155401A1

公开(公告)日：2022-07-21

申请号：PCT/US2022/012411

申请日：2022-01-14

Applicant: NEC LABORATORIES AMERICA, INC.

Inventor： HAN, Shaobo ,  HUANG, Ming-Fang ,  JI, Philip ,  CHEN, Yuheng ,  SALEMI, Milad

IPC: G08G1/01 ,  G01H9/00 ,  G01D5/353

Abstract: Aspects of the present disclosure describe DFOS systems, methods, and structures that advantageously extract road traffic from DFOS vibration patterns such that anomaly detection is possible. Sensed vibration data is represented accurately as a set of points, where each point is denoted as a tuple with elements indicating a time stamp, a location along a length of a DFOS optical sensing cable, and vibration strength detected at the location at the time. Traffic pattern detection is based on a progressive probabilistic Hough transform (PPHT) that exploits global information from an entire spatial-temporal data snapshot to assess a cause of detected vibrations

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：WO2021207005A1

公开(公告)日：2021-10-14

申请号：PCT/US2021/025474

申请日：2021-04-01

Applicant: NEC LABORATORIES AMERICA, INC.

Inventor： HUANG, Ming-Fang ,  WANG, Ting

IPC: G06Q50/30 ,  G06Q50/10 ,  G08G1/123

Abstract: Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that advantageously are employed in smart stadium or other venue applications, such applications including: parking lot security and management; intrusion detection; social sensing; air quality monitoring and early fire detection among others

公开(公告)号：WO2020237129A1

公开(公告)日：2020-11-26

申请号：PCT/US2020/034165

申请日：2020-05-22

Applicant: NEC LABORATORIES AMERICA, INC. ,  NEC CORPORATION

Inventor： LI, Yaowen ,  HUANG, Ming-Fang ,  MURAKAMI, Shuji ,  JI, Philip ,  WANG, Ting

IPC: G01K11/32

Abstract: Aspects of the present disclosure describe single mode fiber distributed temperature sensing (DTS) with improved noise characteristics employing superluminescent emitting diodes (SLEDs) and/or amplified spontaneous emission (ASE) light sources.

公开(公告)号：WO2020236867A1

公开(公告)日：2020-11-26

申请号：PCT/US2020/033694

申请日：2020-05-20

Applicant: NEC LABORATORIES AMERICA, INC. ,  NEC CORPORATION

Inventor： HUANG, Ming-Fang ,  LI, Yaowen

IPC: G01K11/32 ,  G01K11/3206 ,  G01K11/324 ,  G01K13/00 ,  G01K15/007 ,  G01M11/3109

Abstract: Aspects of the present disclosure describe monitoring of optical fiber by distributed temperature sensing (DTS) and determining optical fiber degradation and/or abnormal environmental events including landslides, fires, etc., from DTS data.

公开(公告)号：WO2020206386A1

公开(公告)日：2020-10-08

申请号：PCT/US2020/026760

申请日：2020-04-04

Applicant: NEC LABORATORIES AMERICA, INC. ,  NEC CORPORATION

Inventor： HUANG, Ming-Fang ,  WANG, Ting

IPC: H04N7/18 ,  H04N7/22 ,  H04B10/25

Abstract: Aspects of the present disclosure describe distributed optical fiber sensing for smart city applications in which distributed optical fiber sensing is integrated with a surveillance system into a single system such that the distributed sensing system may detect an event of interest and the surveillance system including cameras may be reoriented in response to verify and/or examine and/or acquire video of the event. Of particular advantage such distributed fiber sensing may include distributed acoustic sensing (DAS) for vibrational sensing and distributed temperature sensing (DTS) for temperature sensing. The integrated system employs shared optical fiber transport for the distributed sensing and the surveillance.

公开(公告)号：WO2020006417A1

公开(公告)日：2020-01-02

申请号：PCT/US2019/039842

申请日：2019-06-28

Applicant: NEC LABORATORIES AMERICA, INC.

Inventor： HUANG, Yue-Kai ,  IP, Ezra ,  JI, Philip ,  HUANG, Ming-Fang

IPC: G02B6/12

Abstract: Aspects of the present disclosure describe systems, methods and structures providing bidirectional optical fiber communication and sensing using the same fiber transmission band and bidirectional WDM fiber sharing such that communications channels and optical fiber sensing channel(s) coexist on the same fiber. As a result, nonlinear interaction between communications channels and interrogating pulse(s) of sensing are much reduced or eliminated.

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