High resolution strain sensor for earthquake precursor observation and earthquake monitoring

Wentao Zhang; Wenzhu Huang; Li Li; Wenyi Liu; Fang Li

doi:10.1117/12.2237216

30 May 2016 High resolution strain sensor for earthquake precursor observation and earthquake monitoring

Wentao Zhang, Wenzhu Huang, Li Li, Wenyi Liu, Fang Li

Proceedings Volume 9916, Sixth European Workshop on Optical Fibre Sensors; 99160G (2016) https://doi.org/10.1117/12.2237216
Event: Sixth European Workshop on Optical Fibre Sensors (EWOFS'2016), 2016, Limerick, Ireland

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.

Citation Download Citation

Wentao Zhang, Wenzhu Huang, Li Li, Wenyi Liu, and Fang Li "High resolution strain sensor for earthquake precursor observation and earthquake monitoring", Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99160G (30 May 2016); https://doi.org/10.1117/12.2237216

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