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.

公开(公告)号：US20220263579A1

公开(公告)日：2022-08-18

申请号：US17580572

申请日：2022-01-20

Applicant: NEC Laboratories America, Inc.

Inventor： Philip JI ,  Ting WANG ,  Zilong YE

IPC: H04B10/272

Abstract: Aspects of the present disclosure describe a method of placement of sensors for DFOS systems, methods, and structures that advantageously employ concurrent sensing. In sharp contrast to the prior art, our inventive method—a heuristic method based on the Explore-and-Pick (EnP) algorithm, which we call a modified EnP (mEnP) method—includes two procedures. The first procedure of our mEnP method explores all possible sensing fiber routes (both linear and star-like routes) for each node in the given network. The second procedure applies a modified greedy algorithm for minimum set cover to select the minimum set of DFOS assignment to fully cover all the links in the given network.

公开(公告)号：US20220149932A1

公开(公告)日：2022-05-12

申请号：US17496722

申请日：2021-10-07

Applicant: NEC Laboratories America, Inc.

Inventor： Philip JI ,  Ting WANG ,  Zilong YE

IPC: H04B10/032

Abstract: Aspects of the present disclosure describe distributed fiber optic sensor systems, methods, and structures that advantageously enable/provide for the proper placement/assignment of sensors in the DFOS network to provide for high reliability, fault tolerant operation that survives fiber failures.

公开(公告)号：US20220065690A1

公开(公告)日：2022-03-03

申请号：US17410820

申请日：2021-08-24

Applicant: NEC Laboratories America, Inc.

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

IPC: G01H9/00 ,  G06E3/00 ,  G01D5/353

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：US20210356332A1

公开(公告)日：2021-11-18

申请号：US17321464

申请日：2021-05-16

Applicant: NEC Laboratories America, Inc.

Inventor： Jian FANG ,  Ting WANG

IPC: G01K11/322 ,  G01D5/353 ,  G01K11/324

Abstract: Aspects of the present disclosure describe systems, methods, and structures for distributed temperature sensing that employ joint wavelet denoising to achieve desirable signal-to-noise ratio(s) over extended sensor fiber distances.