地震检波器的横向灵敏度特性

地震检波器受到地面横向运动激励时的输入输出关系定义为检波器的横向灵敏度特性.本文对检波器线圈受到横向激励时产生的轴向振动进行了分析.可以看到,当悬挂线圈的弹簧片悬丝发生动力失稳时,检波器的横向灵敏度突然增大;在线圈横向振幅很小的情况下,失稳频率接近悬丝的横向固有频率.利用谱分析技术可以准确地从检波器噪声中检测出检波器的横向灵敏度和失稳频率,即检波器假频.

CHARACTERISTIC OF THE GEOPHONE TRANSVERSE SENSITIVITY

The input-output relationship of the geophones being excited by the ground horizontal motion is defined as the transverse sensitivity characteristic of the geophones. The axial oscillation of the coil in a geophone excited by transverse motion is discussed in this paper. From the analyses, we can conclude that the transverse sensitivity of geophones rises steeply as the spring arm turns to dynamic instability, and that this unstable frequency is close to the transverse natural frequency of the spring arm if the transverse vibration of the coil is weak. By use of the spectral analysis technique, the transverse sensitivity and the unsteady frequency or the spurious frequency of the geophones can be exactly determined from the geophone noise.