Fiber optic three-component seismometer

Dongshan Jiang; Wentao Zhang; Fang Li

doi:10.1117/12.2029170

15 October 2013 Fiber optic three-component seismometer

Dongshan Jiang, Wentao Zhang, Fang Li

Proceedings Volume 8924, Fourth Asia Pacific Optical Sensors Conference; 89240G (2013) https://doi.org/10.1117/12.2029170
Event: Asia Pacific Optical Sensors Conference 2013, 2013, Wuhan, China

Abstract

Three-component seismometer is widely used in oil or gas exploration, earth quake monitoring. In this paper, an allmetal 3-component optical fiber seismometer is proposed and experimentally demonstrated. The theoretical analysis is given based on electro-mechanical theory. Calibration results show that axis sensitivity is 41 dB (re: 0 dB=1 rad/g) with a fluctuation ±2 dB in frequency bandwidth of 5~400 Hz. A transverse sensitivity of about -40 dB is achieved. The fluctuation of the acceleration sensitivity for the three accelerometers in the seismometer is within ±2.5 dB. The minimum phase demodulation detection accuracy of the phase-generated carrier (PGC) is 10^-5 rad/√Hz, and the minimum detectable acceleration is calculated to be 90 ng/√Hz. With an all-metal structure, the proposed seismometer is expected to improve reliability of long-term use in harsh environment such as ocean bottom seismic wave monitoring in oil or gas exploration.

Citation Download Citation

Dongshan Jiang, Wentao Zhang, and Fang Li "Fiber optic three-component seismometer", Proc. SPIE 8924, Fourth Asia Pacific Optical Sensors Conference, 89240G (15 October 2013); https://doi.org/10.1117/12.2029170

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