Title:
VIBRATION DETECTION OPTICAL FIBER SENSOR AND VIBRATION DETECTION METHOD
Document Type and Number:
WIPO Patent Application WO/2020/054143
Kind Code:
A1
Abstract:
According to the present invention, a light intensity acquisition unit acquires the intensity of output light in which probe light is backscattered by an optical fiber. An OTDR waveform acquisition unit sequentially acquires and stores an OTDR waveform that is a waveform of output light for each optical pulse sent from the light intensity acquisition unit. A moving average acquisition unit acquires and stores a k-th moving average waveform by averaging k-th to (k+M-1)-th OTDR waveforms which are temporally continuous. A differential waveform acquisition unit acquires a differential waveform between a (k+M+N)-th OTDR waveform and a k-th moving average waveform. A statistical information acquisition unit acquires a sample average μ of the differential waveform, and a standard deviation σ. An abnormality degree acquisition unit calculates the abnormality degree at each position and acquires an abnormality degree waveform indicating the abnormality degree. An abnormality determination unit determines whether there is abnormal vibration on the basis of the value of the abnormality degree, and when there is abnormal vibration, acquires the position at which there is the abnormal vibration.
Inventors:
KANDA YOSHIHIRO (JP)
Application Number:
PCT/JP2019/021998
Publication Date:
March 19, 2020
Filing Date:
June 03, 2019
Export Citation:
Assignee:
OKI ELECTRIC IND CO LTD (JP)
International Classes:
G01M99/00; G01H9/00
Foreign References:
| CN108088548A | 2018-05-29 | |||
| CN102865914A | 2013-01-09 | |||
| JP2017026503A | 2017-02-02 |
Attorney, Agent or Firm:
TAIYO, NAKAJIMA & KATO (JP)
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