过阻尼地震检波器阻尼系数测量的研究

A Study on Damping Measurement for Overdamped-Geophones

对动圈式恒速度型过阻尼地震检波器相对阻尼系数的测量方法进行了研究。首先引入了动圈式地震检波器的运动方程和输出方程,随同参数定义给出了这种检波器对直流电流的响应函数;然后讨论了当前两种过阻尼系数的测量方法———经典的参数辨识法及两点法,明确了它们的适用范围;最后提出了一种线性方法。根据该方法,相对过阻尼系数能够表示成检波器响应曲线的半峰高宽度和检波器自然频率乘积的线性函数。研究表明,利用本方法可在较宽阻尼范围取得更好性能,且该方法便于硬件实现。

It was devoted to the relative damping measurement for overdamped geophone with a moving coil of constant velocity. The movement function and output function of the geophone was introduced, from which the response function to a step direct current stimulating was deduced along with the definitions of parameters. Then two methods available for measuring the relative overdamping of a geophone were discussed. They are the classic parameter identification and the two-dot method. The application ranges for each of them were explained. At last, a linearization method was proposed. According to the method, the relative overdamping can be expressed in a linear function of the product of the width of half peak of the response curve by the nature frequency of the geophone. It is showed that better performance can be achieved in an even wider overdamping zone with the proposed method, and the method can be easily realized with hardware.