Title:
ANALYSIS DEVICE AND OPTICAL FIBER SENSING METHOD
Document Type and Number:
WIPO Patent Application WO/2024/029005
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide an analysis device and optical fiber sensing method for an optical fiber sensing device capable of suppressing the effects of displacement due to vibration under a small processing load without causing the deterioration of spatial resolution. An analysis circuit 12 according to the present invention: measures the spectral shift Δν(xi, t) for each section #i of an optical fiber 13 by using a measuring device 11 (steps S01, S02, Si1, Si2); calculates, from the spectral shift, the optical frequency modulation amount f(xi, t) for each of the sections; calculates the cumulative value foffset(t) by accumulating the optical frequency modulation amounts of the sections located closer to a proximal end-side than the analysis position of the optical fiber 13 (step S03, step Si3); and corrects the analysis position xi on the basis of the cumulative value (step Sa1).
Inventors:
OKAMOTO TATSUYA (JP)
IIDA DAISUKE (JP)
KOSHIKIYA YUSUKE (JP)
IIDA DAISUKE (JP)
KOSHIKIYA YUSUKE (JP)
Application Number:
PCT/JP2022/029795
Publication Date:
February 08, 2024
Filing Date:
August 03, 2022
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
G01D5/353; G01D5/26
Foreign References:
| US20200264018A1 | 2020-08-20 | |||
| US20210348971A1 | 2021-11-11 |
Other References:
OKAMOTO TATSUYA; IIDA DAISUKE; OSHIDA HIROYUKI: "Investigation of Tolerance of OFDR-Based DAS to Vibration-Induced Beat Frequency Offset", 2020 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC), OSA, 8 March 2020 (2020-03-08), pages 1 - 3, XP033767774, DOI: 10.1364/OFC.2020.W2A.16
OKAMOTO TATSUYA; IIDA DAISUKE; OSHIDA HIROYUKI: "Vibration-Induced Beat Frequency Offset Compensation in Distributed Acoustic Sensing Based on Optical Frequency Domain Reflectometry", JOURNAL OF LIGHTWAVE TECHNOLOGY, IEEE, USA, vol. 37, no. 18, 15 September 2019 (2019-09-15), USA, pages 4896 - 4901, XP011746248, ISSN: 0733-8724, DOI: 10.1109/JLT.2019.2933643
OKAMOTO TATSUYA; IIDA DAISUKE; OSHIDA HIROYUKI: "Vibration-Induced Beat Frequency Offset Compensation in Distributed Acoustic Sensing Based on Optical Frequency Domain Reflectometry", JOURNAL OF LIGHTWAVE TECHNOLOGY, IEEE, USA, vol. 37, no. 18, 15 September 2019 (2019-09-15), USA, pages 4896 - 4901, XP011746248, ISSN: 0733-8724, DOI: 10.1109/JLT.2019.2933643
Attorney, Agent or Firm:
OKADA, Kenji et al. (JP)
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