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.

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

IPC: H04L9/32 ,  G01K11/32 ,  H04L9/06

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.