电信传输地震台网——768工程取得成果h

如何精确地测定地震观测系统的频谱特性,是测震学中的一项重要课题。目前所用的分段测量和计算的方法,不仅需要一定的仪器设备,而且还忽略了机(拾震器)——电(放大装置)接口部分的相互作用和影响。因此,不能获得精确的幅频特性,也不能用实验直接得出相位特性。 本文通过傅里叶变换推导出计算与实测任何一种测震系统频谱特性的方法————TS方法,其中用三角波与阶跃函数作为测试信号。 如果对测试信号的动态响应已知,则所研究的系统频谱特性可立即求得。 

ANALYSIS AND MEASUREMENT OF SPECTRAL CHARACTERISTICS OF A SEISMIC RECORDING SYSTEM

The problem of accurately measure the spectral characteristics of a seismic observational system is an important subject of investigation in seismology. At present, the usual method to measure and calculate is by separate sections. In this way, it requires not only a certain amount of instrumental work, but also neglects the mutual effect between the seismograph and the amplifier at their junction. As a result, neither can the phase-characteristics be directly determined by experiment nor accurate amplitude-frequency characteristics be obtained.In this paper, a method has been proposed for the determination of the spectral characteristics of any seismic observational system by means of Fourier Transform. It is called the TS-method. Two testing signals are used, a triangular and a step function pulse. If the dynamic response of the testing signals are known the spectral characteristics of the system under investigation can be found immediately.