30 May 2016 High resolution strain sensor for earthquake precursor observation and earthquake monitoring
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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.
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Wentao Zhang, Wentao Zhang, Wenzhu Huang, Wenzhu Huang, Li Li, Li Li, Wenyi Liu, Wenyi Liu, Fang Li, 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); doi: 10.1117/12.2237216; https://doi.org/10.1117/12.2237216
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