【摘要】 面向地震综合观测需要,自主研制了窄线宽光纤光栅谐振腔,并将其作为核心传感元件,发展了一种基于有效腔长的光纤应变、地震波和温度多参量同步测量新方法。采用边带扫频激光技术实现了高精度多参量光纤信号同步解调,研制出了光纤地壳形变、地震与温度多参量探头,并开展了多参量地震综合观测实验。实验结果表明,所研制的光纤多参量传感系统应变与温度测量分辨率分别达到4.7×10^-10和6×10^-5℃,能够同时记录到清晰的固体潮汐信号、地震波信号以及环境温度扰动,有望为多参量地震同步观测提供先进的技术手段。更多还原

【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 multiparameter 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.更多还原