FBS-3A型反馈式宽频带地震计的传递函数

FBS-3A型反馈式宽频带地震计是目前广泛使用的一种地震计．对其传递函数开展相关研究，对仪器的使用、观测数据的分析，以及仪器的设计开发具有十分重要的实际意义．本文运用系统分析方法，从阐明仪器的工作原理入手，详尽地推导了该地震计的传递函数（包括标定过程的传递函数和测量过程的传递函数）；在此基础上，分析了其零、极点在复频域的分布情况，从而提供了将该地震计系统从一个高阶系统简化成为一个二阶系统的依据．此外，还以传递函数为基础，对该地震计的频率特性进行了数学仿真计算. 

TRANSFER FUNCTION OF FBS-3A FEEDBACK BROADBAND SEISMOMETER

FBS 3A feedback broadband seismometer has been widely utilized in observation networks up to now. Therefore, it is very important and practically meaningful for the application of this kind of sensor to fulfill some relative research work about its transfer function and for the analysis to the data recorded and the further development of the seismometer. In this paper, from the viewpoint of achieving its working principle, method of systematic analysis is applied to deduce the transfer functions, including both the transfer function for calibration and that for measurement. Moreover, on the basis of that, the distribution of its zeros and poles in a complex frequency domain is analyzed, which provides a convincing evidence to simplify this seismometer system from a high order one to a two order one. And the emulation of the frequency characteristics of FBS 3A is presented in this paper. On the whole, the aim of this article is to do some theoretical work about the earthquake observation sensor, and also to introduce the method of making systematic analysis in a complex frequency domain to the research and the development of the seismometers.