Title:
STAKE POSITION CHANGE DETECTION SYSTEM AND STAKE POSITION CHANGE DETECTION METHOD
Document Type and Number:
WIPO Patent Application WO/2024/075153
Kind Code:
A1
Abstract:
A stake position change detection system according to the present disclosure comprises: a distribution-type vibration measurement device that acquires, for an optical fiber cable strung over intervals of stakes, a vibration distribution waveform represented by the distance of the optical fiber cable in the longitudinal direction and time for each of the intervals of the stakes; and an analysis processing device that calculates, from the acquired vibration distribution waveform, the propagation velocity of vibration propagating through the optical fiber cable for each of the intervals of the stakes, and determines, upon detection of a change in the propagation velocity, that the position of a stake in one of the intervals of the stakes where the change in the propagation velocity has been detected was changed.
Inventors:
KITO CHIHIRO (JP)
OKAMOTO TATSUYA (JP)
OKAMOTO TATSUYA (JP)
Application Number:
PCT/JP2022/036948
Publication Date:
April 11, 2024
Filing Date:
October 03, 2022
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
G01B11/14
Foreign References:
| JP2020134142A | 2020-08-31 | |||
| JP2022115759A | 2022-08-09 | |||
| JPS5262049A | 1977-05-23 | |||
| JP2020168232A | 2020-10-15 |
Other References:
小林佑輝外2名. 坑井内に展開した光ファイバーを用いての地震観測の可能性について －本邦初のDAS計測で観測された自然地震を例として－. 物理探査. 2018, vol. 71, pp. 56-70, (KOBAYASHI, Yuki et al. On the feasibility of the monitoring of earthquake event utilizing an optical fiber deployed inside a well - An example of an earthquake event detected by passive DAS recording in a deep well in Japan -. Geophysical Exploration.)
Attorney, Agent or Firm:
OKADA, Kenji et al. (JP)
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