数字地震仪防潮技术的实验研究

Study of dampproof technique for digital seismograph

近年,我国建立了大批的数字化地震台站,数字地震观测正逐渐取代模拟观测。而其地震计因采用电子反馈技术及其较宽的频带等,容易受到潮湿、气流扰动、温度变化等因素的影响,使地震记录产生无规则的漂移,尤其是仿真中长周期后更明显。为解决这些问题,本文介绍一种用于FBS-3A型地震计的保温防潮防护罩的设计制作原理,鹤岗地震台实际使用后效果显著。

Many seismic observation stations have been established in recent years. Digital instruments, with wide bandwidth, high resolution and dynamic range, are replacing the conventional instruments. Using digital instruments allow us get high quality data. However, digital seismograph is easy to be affected by humidity, air and temperature fluctuation etc. When the stations are in bad environment, irregular excursion may be large in the wave record. Long-middle period irregular emulational excursion is especially evident. We design a moistureproof shield with heat preservation for FBS-3A seismograph. In this paper, we present a simple introduction to the principles of the shield. We compare the results of observation when the shield is used to those records without shield.