公开(公告)号：US20230412266A1

公开(公告)日：2023-12-21

申请号：US18319457

申请日：2023-05-17

Applicant: NEC Laboratories America, Inc.

Inventor： Christopher WHITE ,  Jian FANG ,  Sarper OZHARAR ,  Ting WANG

IPC: H04B10/071 ,  H04B10/2575

CPC classification number: H04B10/071 ,  H04B11/00 ,  H04B10/25756

Abstract: A method for time synchronization using distributed fiber optic sensing (DFOS) that employs several trusted time beacons that are attached to the DFOS sensing fiber which in turn is connected to the DFOS interrogator. The beacons transmit their signal via two different mediums, (1) wirelessly to sensor nodes in the coverage area, and (2) through vibrations on fiber to the DFOS/DAS system located at a trusted area such as the central office. Wireless broadcast to nearby sensors includes a timestamp and beacon ID. All the sensors in the field use one of the beacons in their vicinity (the one with the strongest signal) as their time reference and send the data back with the corresponding beacon index.

公开(公告)号：US20230366725A1

公开(公告)日：2023-11-16

申请号：US18316199

申请日：2023-05-11

Applicant: NEC Laboratories America, Inc.

Inventor： Yue TIAN ,  Yangmin DING ,  Sarper OZHARAR ,  Shaobo HAN ,  Ting WANG ,  Jiatong LI ,  Zuocheng JIANG ,  Yuanda XU

IPC: G01H9/00 ,  G06N20/00

CPC classification number: G01H9/004 ,  G06N20/00

Abstract: A distributed fiber optic sensing (DFOS) / distributed acoustic sensing (DAS) system and method employing a fiber optic sensor cable that collects vibrational data of individual utility poles suspending the fiber optic sensor cable and stores the vibrational data in a central office (CO). Machine learning (ML) models are developed, trained, and utilized to analyze vibrational features of the utility poles and determine their integrity. Additionally, DFOS / DAS systems and methods according to the present disclosure determine the location(s) of fiber coils that exist along a length of a fiber optic sensor cable.

公开(公告)号：US20230366703A1

公开(公告)日：2023-11-16

申请号：US18316208

申请日：2023-05-11

Applicant: NEC Laboratories America, Inc.

Inventor： Yue TIAN ,  Yangmin DING ,  Sarper OZHARAR ,  Shaobo HAN ,  Ting WANG ,  Jiatong LI ,  Zuocheng JIANG ,  Yuanda XU

IPC: G01D5/353 ,  G01H9/00 ,  G06N20/00

CPC classification number: G01D5/35358 ,  G01H9/004 ,  G06N20/00

Abstract: A distributed fiber optic sensing (DFOS)/distributed acoustic sensing (DAS) system and method employing a fiber optic sensor cable that collects vibrational data of individual utility poles suspending the fiber optic sensor cable and stores the vibrational data in a central office (CO). Machine learning (ML) models are developed, trained, and utilized to analyze vibrational features of the utility poles and determine their integrity. Additionally, DFOS/DAS systems and methods according to the present disclosure determine the location(s) of fiber coils that exist along a length of a fiber optic sensor cable.

公开(公告)号：US20230358907A1

公开(公告)日：2023-11-09

申请号：US18311874

申请日：2023-05-03

Applicant: NEC Laboratories America, Inc.

Inventor： Philip JI ,  Christopher WHITE ,  Ting WANG

IPC: G01V1/22 ,  G01V1/00 ,  G01V1/16

CPC classification number: G01V1/226 ,  G01V1/001 ,  G01V1/168 ,  G01V2210/1425

Abstract: A flexible, rapid deployable perimeter monitoring system and method that employs distributed fiber optic sensing (DFOS) technologies and includes a deployment/operations field vehicle including an interrogator and analyzer/processor. The deployment/operations field vehicle is configured to field deploy a ruggedized fiber optic sensor cable in an arrangement that meets a specific application need, and subsequently interrogate/sense via DFOS any environmental conditions affecting the deployed fiber optic sensor cable. Such sensed conditions include mechanical vibration, acoustic, and temperature that may be advantageously sensed/evaluated/analyzed in the deployment/operations vehicle and subsequently communicated to a central location for further evaluation and/or coordination with other monitoring systems. Upon completion, the field vehicle and DFOS reconfigure a current location or redeployed to another location.

公开(公告)号：US20230130862A1

公开(公告)日：2023-04-27

申请号：US17968997

申请日：2022-10-19

Applicant: NEC Laboratories America, Inc.

Inventor： Sarper OZHARAR ,  Yue TIAN ,  Ting WANG ,  Yangmin DING

IPC: G01H9/00 ,  G01S15/89 ,  G01F23/296 ,  G01N23/203 ,  G01S7/52

Abstract: Aspects of the present disclosure describe snow / water level detection using distributed fiber optic sensing / distributed acoustic sensing (DFOS/DAS) and an integrated ultrasonic device that advantageously operates over existing optical telecommunications facilities carrying live telecommunications traffic - or optical facilities deployed specifically for such detection. DFOS/DAS monitoring of snow / water level advantageously monitors large areas with high sensitivity while exhibiting robustness to changing environmental conditions and employs a remote (utility pole or other mounting) mounted ultrasonic sensor/transducer that provides snow / water level data in real-time as a coded vibrational signal.

公开(公告)号：US20230029221A1

公开(公告)日：2023-01-26

申请号：US17869785

申请日：2022-07-20

Applicant: NEC Laboratories America, Inc.

Inventor： Yangmin DING ,  Sarper OZHARAR ,  Yue TIAN ,  Ting WANG ,  Yuandu XU

IPC: G01D5/353 ,  G01H9/00

Abstract: Systems, and methods for monitoring galloping of overhead transmission lines using distributed fiber optic sensing (DFOS) in combination with frequency domain decomposition (FDD) (frequency domain) algorithms/methods. A DFOS interrogator/analyzer is used to collect real-time data for pre-processing. The pre-processed data is further processed by processing algorithms, which provide results to a graphical user interface or other reporting mechanisms that provide real-time monitoring, alarming, and reporting of the galloping status of the overhead transmission lines.

公开(公告)号：US20230028676A1

公开(公告)日：2023-01-26

申请号：US17871816

申请日：2022-07-22

Applicant: NEC Laboratories America, Inc.

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

IPC: G01H9/00

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：US20220334165A1

公开(公告)日：2022-10-20

申请号：US17719322

申请日：2022-04-12

Applicant: NEC Laboratories America, Inc.

Inventor： Yangmin DING ,  Sarper OZHARAR ,  Yue TIAN ,  Ting WANG

IPC: G01R31/08 ,  G01H9/00

Abstract: Distributed fiber optic sensing (DFOS) systems and methods for monitoring electrical power distribution transformers and locating failing/failed/malfunctioning transformers from humming signals indicative of a transformer's operational integrity and are advantageously detected/analyzed via DFOS mechanisms.

公开(公告)号：US20220326112A1

公开(公告)日：2022-10-13

申请号：US17715002

申请日：2022-04-06

Applicant: NEC Laboratories America, Inc.

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

IPC: G01M7/08 ,  G01D5/353 ,  G01H9/00

Abstract: A system and method to assess utility pole integrity, by using existing telecom fiber optic cable as a sensor cable, instant mechanical impact on the pole(s), DAS technology and a machine learning model. An instant mechanical impact creates a vibration event on the optical fiber cable mounted/suspended on a target pole, which is detected/recorded by DAS. By applying a machine learning model on the DAS signals, the target pole's integrity condition is obtained.

公开(公告)号：US20220321219A1

公开(公告)日：2022-10-06

申请号：US17713171

申请日：2022-04-04

Applicant: NEC Laboratories America, Inc.

Inventor： Philip JI ,  Ting WANG ,  Zilong YE

IPC: H04B10/27 ,  H04Q11/00

Abstract: A procedure to solve the DFOS placement problem that uses a genetic algorithm to achieve a global optimization of sensor placement. First, our procedure according to aspects of the present disclosure defines a fitness function that counts the number of DFOS sensors used. Second, the procedure uses a valid DFOS placement assignment to model an individual in the genetic algorithm. Each individual consists of N genes, where N is the number of nodes in the given network infrastructure, e.g., N=|V|. Each gene has two genomes: (1) a list of 0s and/or 1s, in which is represent the network nodes that are equipped with DFOS sensors, and 0s represent the nodes that are not equipped with DFOS sensors; (2) a list of sensing fiber routes. An individual that has smallest number of is in their genes will be considered as the strongest individual. Thirdly, the procedure randomly generates a population of individuals. After a certain number of generations of population, the strongest individual in the last generation will be the global optima for the DFOS placement assignment.