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11.发明公开公开(公告)号：US20230228617A1
公开(公告)日：2023-07-20
申请号：US18126409
申请日：2023-03-25
Applicant: NEC Laboratories America, Inc.
Inventor： Junqiang HU , Ting WANG
Abstract: Distributed fiber optic sensing systems (DFOS) methods, and structures that employ DVS / DAS point sensors and a two-stage processing methodology / structure that advantageously enable point sensors to send sensor data at any time - thereby providing significant processing advantages over the prior art.
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公开(公告)号：US20220247562A1
公开(公告)日：2022-08-04
申请号：US17589863
申请日：2022-01-31
Applicant: NEC Laboratories America, Inc.
Inventor： Qiang WANG , Junqiang HU , Jian FANG , Yaowen LI , Ting WANG
Abstract: Physimetric-based data security for coded distributed temperature sensing (DTS) in which physimetric information is extracted from a coded-DTS interrogator which is unique for each interrogator at each operating run time—and used to reconstruct a final temperature determination from DTS data. The physimetric information includes coded-DTS pulse code and coded-DTS pulse profile information as a key to permit secure sharing with authorized users. The pulse code and pulse profile information are encrypted and made available to an authorized user. The authorized user can then decrypt the pulse code and pulse profile information and subsequently use this key information (pulse profile and pulse code files) to retrieve temperature information from for example, a remote computer providing a continuous raw data feed—without being susceptible to eavesdropping. The pulse profile and pulse code files permit reconstruction of temperature from DTS continuous raw data feed which have no meaningful informational value to an eavesdropper who has no access to the unencrypted pulse profile and pulse code information.
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13.发明申请公开(公告)号：US20200370950A1
公开(公告)日：2020-11-26
申请号：US16879505
申请日：2020-05-20
Applicant: NEC Laboratories America, Inc.
Inventor： Ezra IP , Yue-Kai HUANG , Junqiang HU , Shuji MURAKAMI
Abstract: Aspects of the present disclosure describe Rayleigh fading mitigation via short pulse coherent distributed acoustic sensing with multi-location beating-term combination. In illustrative configurations, systems, methods, and structures according to the present disclosure employ a two stage modulation arrangement providing short interrogator pulses resulting in a greater number of sensing data points and reduced effective sectional length. The increased number of data points are used to mitigate Rayleigh fading via a spatial combining process, multi-location-beating combining (MLBC) which uses weighted complex-valued DAS beating results from neighboring locations and aligns phase signals of each of the locations, before combining them to produce a final DAS phase measurement. Since Rayleigh scattering is a random statistic, the MLBC process allows capture of different statics from neighboring locations with correlated vibration/acoustic signal. The combined DAS results minimize a total Rayleigh fade, in both dynamic fading and static fading scenarios.
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公开(公告)号：US20240247974A1
公开(公告)日：2024-07-25
申请号：US18417798
申请日：2024-01-19
Applicant: NEC Laboratories America, Inc.
Inventor： Junqiang HU , Yue-Kai HUANG
CPC classification number: G01H9/004 , G01D5/35361
Abstract: Disclosed is a forward phase method using regular narrow line width CW laser, to cover the acoustic band with reduced processing speed, while tolerant laser frequency drift. A narrow linewidth CW laser is used to launch its power into an optical fiber at a transmitter side. At a receiver side, another narrow linewidth CW laser is used to coherently detect the received signal. The detected signal, which includes both X and Y polarizations, each having in-phase and quadrature to represent a “complex” channel, are connected to an ADC's inputs. Signal processing following the ADC inputs and extracts the phase change of the acoustic band.
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公开(公告)号：US20230152152A1
公开(公告)日：2023-05-18
申请号：US17989589
申请日：2022-11-17
Applicant: NEC Laboratories America, Inc.
Inventor： Philip JI , Junqiang HU , Ting WANG , Ming-Fang HUANG , Yuheng CHEN
IPC: G01H9/00 , H04B10/071 , G01D5/353
CPC classification number: G01H9/006 , H04B10/071 , G01D5/35361
Abstract: Disclosed are distributed fiber optic sensing arrangements that—in sharp contrast to the prior art—utilize C-OTDR capabilities to detect an optical fiber end point while still maintaining operational DFOS vibration/acoustic signal sensing functions. Advantageously, such operations are performed automatically without requiring a manual confirmation. A change is made in digital signal processing in the C-OTDR operation by bypassing a high-pass-filtering stage when calculating intensity changes such that the DC signal component is preserved and used to differentiate from a “no-fiber” section. It then calculates the no-fiber section's signal level and uses a back-tracking operation to determine the fiber end automatically.
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Patent Agency Ranking
公开(公告)号：US20220187121A1
公开(公告)日：2022-06-16
申请号：US17548581
申请日：2021-12-12
Applicant: NEC Laboratories America, Inc.
Inventor： Junqiang HU , Yue-Kai HUANG , Ezra IP
Abstract: Aspects of the present disclosure describe systems, methods and structures for coherent distributed sensing that employs a moving average method among locations along a sensing fiber employing a user configured number of taps that involves location grouping and a group's internal phase alignment followed by an inter-group phase alignment and combining. Our method employs two steps of rotation to achieve the alignment: intra-group rotation and inter-group rotation to align the phase of all participating sensing fiber locations.
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公开(公告)号：US20200249076A1
公开(公告)日：2020-08-06
申请号：US16783119
申请日：2020-02-05
Applicant: NEC Laboratories America, Inc.
Inventor： Ezra IP , Yue-Kai HUANG , Junqiang HU , Philip JI , Shuji MURAKAMI , Yaowen LI
IPC: G01H9/00
Abstract: Aspects of the present disclosure describe optical fiber sensing systems, methods and structures and application employing coherent detection of backscattered signals.
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公开(公告)号：US20170209726A1
公开(公告)日：2017-07-27
申请号：US15412431
申请日：2017-01-23
Applicant: NEC Laboratories America, Inc.
Inventor： Junqiang HU , Ting WANG
CPC classification number: A62C37/50 , A62C13/76 , H04Q9/00 , H04Q2209/82 , H04Q2209/883
Abstract: Aspects of the present disclosure describe apparatus, methods and systems for monitoring the operational status of fire extinguishers through the utilization of optically sensed, color profile determinations of a pressure gauge positioned on the fire extinguisher as well as the utilization of vibrational, and location sensing devices. Advantageously, monitoring apparatus according to the present disclosure are networkable, and a number of their operational characteristics may be configured via the network and associated servers. Furthermore, monitoring apparatus according to the present disclosure may employ vibrational, acceleration, GPS, RFID, and ultrasonic sensors to detect movement, location, and obstructions. In sharp contrast to the prior art, apparatus, methods and systems according to the present disclosure operate with existing fire extinguishers and provide a convenient, cost effective, and highly functional upgrade path for deployed fire extinguishers.
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公开(公告)号：US20130091399A1
公开(公告)日：2013-04-11
申请号：US13646470
申请日：2012-10-05
Applicant: NEC LABORATORIES AMERICA, INC.
Inventor： Junqiang HU , Lei XU , Ting WANG
IPC: H03M13/13
CPC classification number: H03M13/13 , H03M13/1117 , H03M13/1137 , H03M13/1145 , H03M13/116
Abstract: A Quasi-Cyclic, LDPC, large girth, soft-decision decoder and accompanying methods.
Abstract translation: 准循环，LDPC，大环，软判决解码器及其附带的方法。
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20.发明申请公开(公告)号：US20220321214A1
公开(公告)日：2022-10-06
申请号：US17699148
申请日：2022-03-20
Applicant: NEC Laboratories America, Inc.
Inventor： Yue-Kai HUANG , Junqiang HU
IPC: H04B10/079 , H04B10/294 , H04B10/69 , G02B6/02
Abstract: Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that advantageously overcome problems encountered when operating DFOS systems over operational telecommunications facilities namely, cross-phase modulation, and uneven amplitude profiles through the use of a novel constant amplitude coded DFOS employing suppressed out-of-band signaling.
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