数控测井地面系统中模拟信号分离单元的设计

摘要

在全面、细致地分析了井下仪器回传信号的类型、数据通信的特点基础上，测井仪器的回传的模拟信号均是低频信号，因此模拟信号分离单元电路采用压控电压源二阶低通滤波及电压跟随电路,可将低频模拟信号有效地分离出来。以磁记号信号为例，实验表明，模拟信号经过分离单元，滤除了高频干扰信号，为后期模拟量信号的采集处理提供了可靠保障。%By analyzing the types of return signals from the downhole instrument and the characteristics of data communications entirely, the analog signal of logging instrument back has low frequency. Then, the analog signal separation unit, which uses voltage-controlled voltage source order low pass filter and voltage follower circuits, can isolate the low-frequency signal effectively. For example, high-frequency interference signal in the magnetic signal has been removed by the analog signal separation unit. It can provide reliable guarantee for the late analog signal acquisition.