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Sensors (Basel). 2016 Dec 28;17(1). pii: E47. doi: 10.3390/s17010047.

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

Author information

1
College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130061, China. chenjd13@mails.jlu.edu.cn.
2
College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130061, China. tchang@jlu.edu.cn.
3
Institute of Automation, Shandong Academy of Sciences, Jinan 250014, China. tchang@jlu.edu.cn.
4
College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130061, China. fuqj16@mails.jlu.edu.cn.
5
College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130061, China. langjp14@mails.jlu.edu.cn.
6
College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130061, China. gaowz15@mails.jlu.edu.cn.
7
Institute of Automation, Shandong Academy of Sciences, Jinan 250014, China. gezhb@sdas.org.
8
College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130061, China. miaoyu14@mails.jlu.edu.cn.
9
Institute of Automation, Shandong Academy of Sciences, Jinan 250014, China. zhangyb@sdas.org.
10
College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130061, China. hcui@jlu.edu.cn.

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.

KEYWORDS:

fiber optic Michelson interferometer; geophone; phase generated carrier; vibration sensor

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