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Proceedings Paper

High resolution strain sensor for earthquake precursor observation and earthquake monitoring
Author(s): Wentao Zhang; Wenzhu Huang; Li Li; Wenyi Liu; Fang Li
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Paper Abstract

We propose a high-resolution static-strain sensor based on a FBG Fabry-Perot interferometer (FBG-FP) and a wavelet domain cross-correlation algorithm. This sensor is used for crust deformation measurement, which plays an important role in earthquake precursor observation. The Pound-Drever-Hall (PDH) technique based on a narrow-linewidth tunable fiber laser is used to interrogate the FBG-FPs. A demodulation algorithm based on wavelet domain cross-correlation is used to calculate the wavelength difference. The FBG-FP sensor head is fixed on the two steel alloy rods which are installed in the bedrock. The reference FBG-FP is placed in a strain-free state closely to compensate the environment temperature fluctuation. A static-strain resolution of 1.6 n(epsilon) can be achieved. As a result, clear solid tide signals and seismic signals can be recorded, which suggests that the proposed strain sensor can be applied to earthquake precursor observation and earthquake monitoring.

Paper Details

Date Published: 30 May 2016
PDF: 4 pages
Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99160G (30 May 2016); doi: 10.1117/12.2237216
Show Author Affiliations
Wentao Zhang, Institute of Semiconductors (China)
Wenzhu Huang, Institute of Semiconductors (China)
Li Li, Institute of Geophysics, China Earthquake Administration (China)
Wenyi Liu, Second Monitoring Ctr., China Earthquake Administration (China)
Fang Li, Institute of Semiconductors (China)

Published in SPIE Proceedings Vol. 9916:
Sixth European Workshop on Optical Fibre Sensors
Elfed Lewis, Editor(s)

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