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公开(公告)号：US12130189B2
公开(公告)日：2024-10-29
申请号：US17191622
申请日：2021-03-03
Applicant: NEC Laboratories America, Inc.
Inventor： Qiang Wang , Yaowen Li
IPC: G01K11/324 , G01J3/44
CPC classification number: G01K11/324 , G01J3/44
Abstract: Aspects of the present disclosure describe distributed fiber optic sensing systems (DFOSa), methods, and structures for distributed temperature sensing (DTS) that 1) employs a GmAPD instead of a traditional LmAPD detector which advantageously produces a 10˜20 dB gain improvement of SNR for a far-end weak signal, thereby improving long range detectability; 2) employs an inventive gating scheme that advantageously and surprisingly overcomes the “dead time” problem for GmAPD working in SPC mode that plagues Geiger mode operation; and 3) third, employs an inventive post-processing technique that advantageously allows our methods to correct any dark noise caused signal distortion.
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公开(公告)号：US11204286B2
公开(公告)日：2021-12-21
申请号：US16879876
申请日：2020-05-21
Applicant: NEC Laboratories America, Inc.
Inventor： Yaowen Li , Ming-Fang Huang , Shuji Murakami , Philip Ji , Ting Wang
IPC: H04B10/08 , G01K11/324 , H04B10/2507 , H04B10/50
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.
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公开(公告)号：US11387898B2
公开(公告)日：2022-07-12
申请号：US17035551
申请日：2020-09-28
Applicant: NEC Laboratories America, Inc.
Inventor： Ting Wang , Ming-Fang Huang , Yaowen Li , Philip Ji
IPC: H04B10/079 , G01D5/353
Abstract: Aspects of the present disclosure describe optical fiber sensing systems, methods and structures disclosing a distributed optical fiber sensor network constructed on a switched optical fiber telecommunications infrastructure to detect temperatures, acoustic effects, and vehicle traffic—among others—demonstrated with a number of different network topologies.
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Patent Agency Ranking
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.
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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.
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).
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公开(公告)号：US12256002B2
公开(公告)日：2025-03-18
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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公开(公告)号：US11644369B2
公开(公告)日：2023-05-09
申请号：US16878063
申请日：2020-05-19
Applicant: NEC Laboratories America, Inc.
Inventor： Ming-Fang Huang , Yaowen Li
IPC: G01K11/3206 , G01M11/00 , G01K13/00 , G01K11/324
CPC classification number: G01K11/3206 , G01K13/00 , G01M11/3109 , G01K11/324
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.
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公开(公告)号：US10739228B2
公开(公告)日：2020-08-11
申请号：US16258588
申请日：2019-01-26
Applicant: NEC Laboratories America, Inc.
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).
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