CG-5重力仪零漂特性与温度变化的关系分析

Analysis of the relationship between the zero drift characteristics and the temperature change of CG-5 gravimeter

基于4台CG-5重力仪多年的静态测试和安徽测网流动重力观测资料,分析CG-5型重力仪的长期零漂特性和其与温度变化的关系。研究认为:CG-5型重力仪零漂率变化较大,随着投入使用时间的增长,变化幅值逐渐减小;单期静态测试结果显示,仪器观测值经改正后呈较好的线性上升趋势;该型重力仪的零漂率与环境温度有较好的相关性。随着温度的增高,仪器的零漂率会增大,但温度对重力仪的零漂特性的影响有一定的滞后性,零漂率随着仪器所处的长期背景温度的改变而改变,短时间的温差变化对其影响不大。

Based on the static test of four CG-5 gravimeters for many years and the observation data of mobile gravity of Anhui survey network,this paper analyzes the long-term zero drift characteristics of CG-5 gravimeter and its relationship with temperature change.The following conclusions are drawn from the analysis of the drift characteristics of the instrument.The zero drift rate of CG-5 gravimeter changes greatly,and the amplitude decreases with the increase of time.The single period static test results show that the observed values of the instrument show a good linear rising trend after correction.The zero drift rate of the gravimeter has a good correlation with the ambient temperature.With the increase of temperature,the zero drift rate of the instrument will increase.The influence of temperature on the zero drift characteristics of gravimeter has certain hysteresis.The zero drift rate changes with the variation of the long-term background temperature of the instrument.However,the short term change of temperature has little effect on it.