【摘要】 传统地震检波器为"永磁 动圈"式电磁检波器,在信号捡取过程中易受电磁干扰,存在非线性;基带传输的低频模拟信号(10～300Hz)会受干扰。提出一种应用切向激光多普勒技术的地震波检测方法,采用优化设计的差动光路结构方案,研究了信号处理单元的适宜带宽。通过F/V转换可以实时地得到被测速度、位移、加速度和频率。实现了线性测量的频率范围1.0～1000Hz,动态范围100dB。更多还原

【Abstract】 The couple of permanent magnet & coil is used as geophone for many years.In general,there are a few troubles such as electromagnetic interference,permanent magnet’s non-linearity,and base band (10～300 Hz) transmission to be disturbed.A new method of seismic acquisition,which uses tangential laser Doppler effect with an optimized differential optical configuration,was proposed.The frequency bandwidth was properly determined by analyzing the frequency of the Doppler signal.The velocity,displacement,acceleration and frequency can be acquired in real-time by F/V converting the FM Doppler signal.A dynamic range of 100 dB and the linear frequency range of 1.0 to 1 000 Hz are realized.更多还原