• CN 62-1091/P
• ISSN 1001-8166
• 月刊 创刊于1986年
 地球科学进展  2019, Vol. 34 Issue (4): 424-432    DOI: 10.11867/j.issn.1001-8166.2019.04.0424
 地球化学

1. 中国科学院半导体研究所传感技术国家重点实验室，北京 100083
2. 中国科学院大学材料科学与光电子技术学院，北京 100049
Study on Multi-Parameter Seismic Observation Technique Based on Optic Fiber Sensing
Wenzhu Huang1,2(),Wentao Zhang1,2,Fang Li1,2
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
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Abstract:

”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.

Key words: Optic fiber sensing    Crustal deformation    Seismic wave    Temperature    Multi-parameter observation.

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