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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。 频谱特性的近似计算公式可表示如下: 以及 当任意输人函数作用下,系统的响应函数已知时,也可用TS方法求得频谱特性。
How to accurately measure the spectral characteristics of seismic observation system is an important topic in seismology. The presently used method of segment measurement and calculation not only requires certain instrumentation but also neglects the interaction and influence of the machine (pickup) -electrical (amplification) interface part. Therefore, accurate amplitude-frequency characteristics can not be obtained, nor can experimentally derive phase characteristics directly. In this paper, the method of calculating and measuring the spectral characteristics of any kind of seismometric system is deduced by Fourier Transform (TS), in which triangular wave and step function are used as test signals. If the dynamic response to the test signal is known, the spectral properties of the system under investigation can be found immediately. The approximate formula for the spectral characteristics can be expressed as follows: When the system response function is known under any input function, the TS method can also be used to obtain the spectral characteristics.