基于双极性脉冲间歇电压源的土壤电导测量仪

A Electrical Conductance Measurement Instrument Based on Bi-directional Pulsed Interim Voltage Source

从理论上分析了直流激励下土壤的极化效应,提出了一种双极性脉冲间歇电压激励的测量方法,设计了相应的转换电路、程控放大电路,实现了土壤电导的快速测量。双极性脉冲间歇电压激励信号和脉冲法激励信号的对比试验说明,改进后的激励信号能更好地削弱极化效应,测量的结果更加的平稳。

the soil electrode polarization effect under direct current excitation is analyzed by theory. Bi-directional pulsed interim voltage exciting method is put forward. Transfer circuit and programming amplifying circuit are designed. The circuit can realize the measurement of the soil conductance. Comparative experiments between bi-directional pulsed interim voltage exciting signal and pulsed voltage exciting signal are carried out. The experiments show bi-directional pulsed interim voltage exciting method can eliminate polarization effect better, and the measured result is more stable.