Advances in Earth Science ›› 2019, Vol. 34 ›› Issue (4): 424-432. doi: 10.11867/j.issn.1001-8166.2019.04.0424

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Study on Multi-Parameter Seismic Observation Technique Based on Optic Fiber Sensing

Wenzhu Huang 1, 2( ),Wentao Zhang 1, 2,Fang Li 1, 2   

  1. 1. State Key Laboratory of Transducer Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
    2. College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-11-05 Revised:2019-01-12 Online:2019-04-10 Published:2019-05-27
  • About author: Huang Wenzhu (1987-), male, Jiujiang City, Jiangxi Province, Ph.D student. Research areas include optic fiber sensing.| Huang Wenzhu (1987-), male, Jiujiang City, Jiangxi Province, Ph.D student. Research areas include optic fiber sensing.
  • Supported by:
    Project supported by the National Key R & D Program of China "Key technologies and applications of advanced optical fiber sensing materials and devices"(No. 2017YFB0405500);The National Natural Science Foundation of China "Research on key technologies for ultra-high-resolution fiber Bragg grating static strain measurement based on freuquency division character and polarization effect"(No.61605196)

Wenzhu Huang,Wentao Zhang,Fang Li. Study on Multi-Parameter Seismic Observation Technique Based on Optic Fiber Sensing[J]. Advances in Earth Science, 2019, 34(4): 424-432.

”Deep well, wide band, multi-component comprehensive observation” is the development direction of seismic observation. In order to promote the application and development of underground integrated observation system, key technologies, such as high temperature resistance sensor, interference isolation of sensor unit and miniaturization of instrument, need to be developed. Optic fiber sensors have the advantages of small size, passive nature, resistance to electromagnetic interference, being easy to long distance transmission and multi-parametric network observation, which are expected to provide new technology for the comprehensive observation of multi-parameter earthquakes in deep wells. This paper proposed a comprehensive observation technique of seismic wave, crustal deformation and temperature. An integrated borehole seismic sensor based on fiber Bragg grating resonators was designed for measuring three-component earthquake, three-component crustal deformation and temperature signal. A new technique for simultaneous measurement of multi-parameters of temperature and strain of fiber based on effective cavity length was presented. The technique of high precision optical fiber signal demodulation based on single side band sweep laser and the design of multi-parameter integrated optical fiber probe were introduced. The resolution of strain and temperature measurement of the fiber multi-parameter sensor system reached 4.7 × 10-10 and 6×10-5 , respectively. A comprehensive multi-parameter earthquake observation experiment was carried out at the seismic station. The results show that the integrated optical fiber multi-parameter seismic observation system can simultaneously record the earth tide signal, seismic wave signal and environmental temperature disturbance, and has good anti-environmental interference ability and long-term stability, which is expected to provide a new technique for crustal deformation observation.

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