涡流地震检波器的特性及测试方法的研究

RESEARCH ON THE CHARACTERISTICS AND TEST METHOD OF AN EDDY GEOPHONE

本文介绍了涡流地震检波器的工作原理、结构及其频率响应特性——涡流检波器的输出特性在固有频率之上是按外界激励频率的平方递增。高频灵敏度随着激励频率的增加而增高有助于弥补高频信号通过地层传播时的急剧衰减,从而提高了地震勘探的分辨率。在固有频率之下,则加强了低频滤波作用。 本文还以对单自由度线性振动系统的动态分析为基础,研究了利用实验幅频特性曲线来求该系统的固有频率和阻尼系数的方法,推导出必要的计算公式。最后举出一个应用实例,并检验了这种方法的可信度。

This paper describes in detail the working principles, structure and frequency response characteristics of an eddy geophone.Based on the dynamic analysis of the vibrataon system with one freedom, this paper studies the method for evaluating the system's natural frequency and damping coefficient by using experimental amplitude-frequency characteristics curves and has derived some necessary formulas. It also gives an example of application to verify its reliability.The experimental analysis method for evaluating the natural frequency and damping used in this paper is simple, convenient and accurate, and can be applied in similiar systems.