DCY-Ⅰ型地电场仪的工频干扰抑制机制

Power Frequency Interference Suppression Mechanism of DCY-I Geoelectric Field Instrument

为更好地抑制工频干扰对观测信号的影响,在分析工频干扰的来源、分类及其对观测的影响等基础上,对比分析常用的工频共模与工频串模干扰抑制方法,并在DCY-Ⅰ型地电场观测仪器的设计中采用过采样与多级数字滤波等方法抑制工频串模干扰,采用两级浮地的方式抑制工频共模干扰,对工频干扰起到了很好的抑制效果。

To better suppress the influence of power frequency interference on the observation signal,based on the analysis of the source of power frequency interference,the classification of power frequency interference and the influence of power frequency interference on the observation,we compare and analyze the commonly used power frequency common mode interference and power frequency serial mode interference suppression methods,so as to suppress the power frequency serial mode interference in the design of DCY-I geoelectric field observation instrument by using the method of oversampling and multi-level digital filtering.We use the two-level floating ground method to suppress the power frequency common mode interference,which can play a good suppression effect on the power frequency interference.