公开(公告)号：US12160261B2

公开(公告)日：2024-12-03

申请号：US18075374

申请日：2022-12-05

Applicant: NEC Laboratories America, Inc.

Inventor： Philip Ji ,  Ting Wang ,  Zilong Ye

IPC: H04B10/032 ,  H04J14/02

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 multiple fiber failures.

公开(公告)号：US12106664B2

公开(公告)日：2024-10-01

申请号：US17968265

申请日：2022-10-18

Applicant: NEC Laboratories America, Inc.

Inventor： Yangmin Ding ,  Yue Tian ,  Sarper Ozharar ,  Ting Wang

IPC: G08G1/04 ,  G01V1/00 ,  G01V1/22 ,  G01V1/30 ,  G08G1/01

CPC classification number: G08G1/04 ,  G01V1/001 ,  G01V1/226 ,  G01V1/30 ,  G08G1/0104

Abstract: Aspects of the present disclosure describe dynamic road traffic noise mapping using DFOS over a telecommunications network that enables mapping of road traffic-induced noise at any observer location. DFOS is used to obtain instant traffic data including vehicle speed, volume, and vehicle types, based on vibration and acoustic signal along the length of a sensing fiber along with location information. A sound pressure level at a point of interest is determined, and traffic data associated with such point is incorporated into a reference noise emission database and a wave propagation theory for total sound pressure level prediction and mapping. Real-time wind speed using DFOS—such as distributed acoustic sensing (DAS)—is obtained to provide sound pressure adjustment due to the wind speed.

公开(公告)号：US11681042B2

公开(公告)日：2023-06-20

申请号：US17195538

申请日：2021-03-08

Applicant: NEC Laboratories America, Inc.

Inventor： Ming-Fang Huang ,  Ting Wang ,  Hansi Liu

IPC: G01S15/42 ,  G01D5/353 ,  G01V1/30 ,  G01V1/18

CPC classification number: G01S15/42 ,  G01D5/353 ,  G01V1/181 ,  G01V1/306

Abstract: Aspects of the present disclosure describe distributed fiber optic sensing systems, methods, and structures that advantageously are employed to determine the location and depth of underground fiber-optic facilities that may be carrying telecommunications traffic.

公开(公告)号：US11619542B2

公开(公告)日：2023-04-04

申请号：US17228675

申请日：2021-04-12

Applicant: NEC Laboratories America, Inc.

Inventor： Sarper Ozharar ,  Yue Tian ,  Yangmin Ding ,  Ting Wang

IPC: G01H9/00

Abstract: Aspects of the present disclosure describe distributed fiber optic sensing (DFOS)—distributed acoustic sensing (DAS) based systems, methods, and structures that advantageously enable and/or facilitate the determination of natural frequency(ies) of civil infrastructures.

公开(公告)号：US20210374468A1

公开(公告)日：2021-12-02

申请号：US17330832

申请日：2021-05-26

Applicant: NEC Laboratories America, Inc.

Inventor： Manmohan Chandraker ,  Ting Wang ,  Xiang Xu ,  Francesco Pittaluga ,  Gaurav Sharma ,  Yi-Hsuan Tsai ,  Masoud Faraki ,  Yuheng Chen ,  Yue Tian ,  Ming-Fang Huang ,  Jian Fang

IPC: G06K9/62 ,  G06T3/00

Abstract: Methods and systems for training a neural network include generate an image of a mask. A copy of an image is generated from an original set of training data. The copy is altered to add the image of a mask to a face detected within the copy. An augmented set of training data is generated that includes the original set of training data and the altered copy. A neural network model is trained to recognize masked faces using the augmented set of training data.

公开(公告)号：US11131578B2

公开(公告)日：2021-09-28

申请号：US16455586

申请日：2019-06-27

Applicant: NEC Laboratories America, Inc.

Inventor： Junqiang Hu ,  Ting Wang

IPC: G01H9/00

Abstract: Aspects of the present disclosure describe systems, methods and structures employing two-stage detection/analysis for distributed vibration sensing (DVS) along an optical fiber in which a first stage provides pre-processed signal data and the second stage—based on the first stage result—only processes locations that have or might have vibrational activity resulting in increased sensitivity and reduced false alarms.

公开(公告)号：US10931366B2

公开(公告)日：2021-02-23

申请号：US16830160

申请日：2020-03-25

Applicant: NEC Laboratories America, Inc.

Inventor： Ting Wang ,  Ming-Fang Huang ,  Tiejun Xia ,  Glenn Wellbrock ,  Yaowen Li ,  Philip Ji

IPC: H04B10/071 ,  G01M11/00 ,  G01D5/353 ,  H04B10/40 ,  H04B10/2575 ,  H04B10/27

Abstract: Aspects of the present disclosure describe optical fiber sensing systems, methods and structures disclosing a distributed fiber sensor network constructed on an existing, live network, data carrying, optical fiber telecommunications infrastructure to detect temperatures, acoustic effects, and vehicle traffic—among others. Of particular significance, sensing systems, methods, and structures according to aspects of the present disclosure may advantageously identify specific network locations relative to manholes/handholes and environmental conditions within those manholes/handholes namely, normal, flooded, frozen/iced, etc.

公开(公告)号：US20190234832A1

公开(公告)日：2019-08-01

申请号：US16258588

申请日：2019-01-26

Applicant: NEC Laboratories America, Inc.

Inventor： Yaowen Li ,  Jian Fang ,  Ting Wang

IPC: G01M11/00 ,  G01H9/00

Abstract: Aspects of the present disclosure describe a multilayer coding method for physical value measurements in which a multi-pulse pattern is generated through several layers, each of which is encoded with a different cyclic codeword. The total coding gain is the product of the gains of each layer advantageously allowing a long cyclic codeword to be replaced by combining several short cyclic codewords. Of particular advantage, methods according to the present disclosure provide better signal-to-noise characteristics, longer sensing distances and lower computational complexity particularly suitable for high-performance and cost-effective distributed optical fiber sensing (DOFS).

公开(公告)号：US10345138B2

公开(公告)日：2019-07-09

申请号：US15385972

申请日：2016-12-21

Applicant: NEC Laboratories America, Inc.

Inventor： Giovanni Milione ,  Philip Nan Ji ,  Ezra Ip ,  Ting Wang

IPC: G01H9/00

Abstract: A system to perform distributed acoustic sensing (DAS) in an environment with acoustic vibrations present includes at least an optical fiber positioned in said environment, wherein the optical fiber comprises N spatial channels and N laser pulses are launched into the N spatial channels of the optical fiber and propagate over a fiber length; and one or more sensors to measure N signals of acoustic vibration amplitude and frequency from each of N spatial channels, wherein the N signals are digitally added for spatial averaging and applied to determine DAS.

公开(公告)号：US10291318B2

公开(公告)日：2019-05-14

申请号：US15964790

申请日：2018-04-27

Applicant: NEC Laboratories America, Inc.

Inventor： Ivan Djordjevic ,  Shaoliang Zhang ,  Ting Wang

IPC: H04B10/00 ,  H04B10/112 ,  H03M13/11 ,  H04L1/00 ,  H04L27/36 ,  H03M13/25 ,  G02B6/028 ,  H04B10/11 ,  H04B10/516 ,  H04L29/06 ,  H04J14/00 ,  H04B10/2581 ,  H04J14/04

Abstract: Aspects of the present disclosure describe physical layer security in optical communications wherein Bessel modes are employed and significantly outperform conventional schemes with respect to secrecy and advantageously benefit from atmospheric turbulence effects with beam splitting attacks.