三分量全光纤加速度地震检波技术的理论与实验研究

With the development of the subtle skills in earthquake monitoring, we need to carry out a deep investigation on the earthquake geophone technology with the advantages of high sensitivity, wide bandwidth and precise location. To validate the need for the precise location in the geophysical survey and seismic monitoring, we have carried out and accomplished the project " The theoretical and experimental research on three-component all optic-fibre acceleration seismic geophone technology", which was granted by National Natural Science Foundation of China from Jan. 2001 to Dec. 2002..On the basis of theoretical study, a dynamic model of three-dimension harmonic oscillator system was established. Force analysis of the three-component all optic-fibre sensor system was performed. A novel harmonic oscillator system based on three-dimensional compliant hollow-cylinder and dual optic paths has been designed. A prototype of geophone has been developed successfully. This device, a phase interference type sensor, can detect three axial accelerations ax, ay and az in-parallel, real-timely and precisely. A practical testing for the device was accomplished by the PM 4808 vibrational exciter, which was made in Denmark. The result shows that output signal of the device is consistent with the input one of the exciter. The measured frequency response curve is in agreement with our theoretical result and the sensitivity reaches 60 mv/cm/s ..Structurally, the three-dimensional harmonic oscillator is formed by a mass and three pairs of compliant cylinders. The mass is simultaneously supported by these three pairs of compliant cylinders in three axial directions. Every pair of the cylinders were wrapped by the fibre of two arms of three single-mode all-fibre Michelson interferometers. .The geophone possesses the advantages of high sensitivity, wide response bandwidth and resistance to electromagnetic wave, etc. It can find wide use in the seismic monitoring, mechanical vibration measurement, inertial navigation in the aerospace and aviation, and the precise location in the exploitation for oil and petroleum，natural gas and metal mineral resources, etc. The research has important academic and practical values..

三分量全光纤加速度检波技术的理论和实验研究：顺变柱体特性参数测试与实验研究、光纤敏感元件、三维光纤干涉系统优化设计、温度补偿、信号处理电路、系统测试实验。研制出加速度三分量（ax ay az)并行、实时、高分辨率检波器，具有频带宽、灵敏度高、抗电磁扇诺扔诺恪？捎糜诘卣鸺嗖狻⒐こ陶穸饬俊⒑娇蘸教旃咝缘己郊笆吞烊黄梢稻范ㄎ弧