【作者】 王广福；

【Author】 Wang Guangfu (Institute of Geophysics,Chinese Academy of Sciences)

【机构】 中国科学院地球物理研究所；

【摘要】 地震仪的动力学特性通常是用频率域中的幅频特性和相频特性表示的,但是,合成地震图和由地震图恢复地面的真实运动都是在时间域中进行的,这就需要知道地震仪的时间特性(脉冲响应特性),从理论上讲,可以由实测地震仪的幅频与相频特性通过快速傅里叶变换(FFT)用数值方法把时间特性计算出来,但是,计算结果表明,误差很大,龙其是在初动部分.因此,计算地震仪的时间特性应该从地震仪的传递函数出发,通过拉普拉斯反变换求得.更多还原

【Abstract】 The dynamic response of a seismograph is usually expressed by means of amplitude- and phase- frequency responses in the frequency domain,but the construction of the synthetic scismogram and the restoration of the true ground motion from seismograms are carried out in the time domain.Therefore,it is nesessary to know the time response(pulse response) of the seismograph.Theoretically,the time response can be numerically computed by using the Fast Fourier Transform(FFT) from experimental amplitude-and phase-frequency response data, but results show that the computation error of time response is larger,especially in the initial motion range.Therefore,in the computation of the time response of a seismograph it is better to use the transfer function,from which the time response may be obtained by the inverse Laplace transformation.更多还原