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Sensors 2017, 17(1), 47; doi:10.3390/s17010047

A Fiber-Optic Interferometric Tri-Component Geophone for Ocean Floor Seismic Monitoring

1
College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130061, China
2
Institute of Automation, Shandong Academy of Sciences, Jinan 250014, China
*
Author to whom correspondence should be addressed.
Academic Editors: Manuel Lopez-Amo, Jose Miguel Lopez-Higuera and Jose Luis Santos
Received: 22 October 2016 / Revised: 7 December 2016 / Accepted: 23 December 2016 / Published: 28 December 2016
(This article belongs to the Special Issue Optical Fiber Sensors 2016)
View Full-Text   |   Download PDF [3318 KB, uploaded 28 December 2016]   |  

Abstract

For the implementation of an all fiber observation network for submarine seismic monitoring, a tri-component geophone based on Michelson interferometry is proposed and tested. A compliant cylinder-based sensor head is analyzed with finite element method and tested. The operation frequency ranges from 2 Hz to 150 Hz for acceleration detection, employing a phase generated carrier demodulation scheme, with a responsivity above 50 dB re rad/g for the whole frequency range. The transverse suppression ratio is about 30 dB. The system noise at low frequency originated mainly from the 1/f fluctuation, with an average system noise level −123.55 dB re rad / Hz ranging from 0 Hz to 500 Hz. The minimum detectable acceleration is about 2 ng / Hz , and the dynamic range is above 116 dB. View Full-Text
Keywords: fiber optic Michelson interferometer; vibration sensor; phase generated carrier; geophone fiber optic Michelson interferometer; vibration sensor; phase generated carrier; geophone
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Chen, J.; Chang, T.; Fu, Q.; Lang, J.; Gao, W.; Wang, Z.; Yu, M.; Zhang, Y.; Cui, H.-L. A Fiber-Optic Interferometric Tri-Component Geophone for Ocean Floor Seismic Monitoring. Sensors 2017, 17, 47.

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