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    SPATIAL RESOLUTION OF A DTS SYSTEM BY IMPULSE RESPONSE DECONVOLUTION AND OPTIMIZATION ALGORITHMS
    4.
    发明申请
    SPATIAL RESOLUTION OF A DTS SYSTEM BY IMPULSE RESPONSE DECONVOLUTION AND OPTIMIZATION ALGORITHMS 审中-公开

    公开(公告)号：US20190234809A1

    公开(公告)日：2019-08-01

    申请号：US16258587

    申请日：2019-01-26

    申请人： NEC Laboratories America, Inc.

    发明人： Yaowen LI ,  Jiaming LIANG

    IPC分类号： G01K11/32

    CPC分类号： G01K11/32 ,  G01K2011/324

    摘要： Aspects of the present disclosure describe Raman based Distributed temperature sensing (DTS) systems with a novel recovery algorithm that improves the spatial resolution of DTS system. The algorithm is based on a linear DTS model and weighted total variation. Furthermore, we describe an additional algorithm which can automatically detect and recover any hot regions along the fiber—with the recovery algorithm as its core—achieving correct reconstruction with a temperature profile down to 10 cm in length—which is equivalent to improving the spatial resolution to about 5 cm

    BIPOLAR CYCLIC CODING FOR BRILLOUIN OPTICAL TIME DOMAIN ANALYSIS
    5.
    发明申请
    BIPOLAR CYCLIC CODING FOR BRILLOUIN OPTICAL TIME DOMAIN ANALYSIS 有权

    公开(公告)号：US20210181059A1

    公开(公告)日：2021-06-17

    申请号：US17115651

    申请日：2020-12-08

    申请人： NEC Laboratories America, Inc.

    发明人： Jian FANG ,  Yaowen LI ,  Ting WANG

    IPC分类号： G01M11/00 ,  G02B6/02

    摘要： Aspects of the present disclosure describe systems, methods and structures providing bipolar cyclic coding for Brillouin optical time domain analysis that may be employed—for example—to determine high accuracy temperature and/or strain measurements along an optical fiber. Systems, methods, and structures according to the present disclosure employ the bipolar cyclic coding technique that advantageously overcomes the problems that plague the prior art and provides extended sensing range resulting from superior signal-to-noise characteristics.

    PHYSIMETRIC-BASED DATA SECURITY FOR CODED DISTRIBUTED TEMPERATURE SENSING
    7.
    发明申请
    PHYSIMETRIC-BASED DATA SECURITY FOR CODED DISTRIBUTED TEMPERATURE SENSING 有权

    公开(公告)号：US20220247562A1

    公开(公告)日：2022-08-04

    申请号：US17589863

    申请日：2022-01-31

    申请人： NEC Laboratories America, Inc.

    发明人： Qiang WANG ,  Junqiang HU ,  Jian FANG ,  Yaowen LI ,  Ting WANG

    IPC分类号： H04L9/32 ,  G01K11/32

    摘要： 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.

    HIGH DYNAMIC RANGE DISTRIBUTED TEMPERATURE SENSING (DTS) USING PHOTON COUNTING DETECTION
    8.
    发明申请
    HIGH DYNAMIC RANGE DISTRIBUTED TEMPERATURE SENSING (DTS) USING PHOTON COUNTING DETECTION 有权

    公开(公告)号：US20210318181A1

    公开(公告)日：2021-10-14

    申请号：US17191622

    申请日：2021-03-03

    申请人： NEC Laboratories America, Inc.

    发明人： Qiang WANG ,  Yaowen LI

    IPC分类号： G01K11/324

    摘要： 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.