一种基于双频率电导率测量方法的研究

A Study of Conductivity Measurement Based on Dual-Frequency Method

提出了一种水电导率的双频率测量方法。该方法通过在电导池上施加两个合适的正弦频率信号,测出两种频率下的阻抗的模,由处理单元解算出水的实际电阻,再由公式求得被测溶液电导率值。双频测定法不存在理论误差,消除了交流测定法中电容效应和极化效应给电导率测量精度带来的影响,能实现精确测量的目的。

This paper describes a method for dual-frequency measurement of water conductivity. This method is applied to two suitable sinusoidal frequency signal on conductivity cell, and measures the modulus of impedance at two frequencies, through the processing unit that solves the actual water resistance, then measures conducti,：ity value obtained from the formula. Dual-frequency measurement does not exist theoretical error, eliminats the effects of capacitance and polariza- tion that using exchange frequency measurement to bring the conductivity measurement accuracy. This method can achieve the purpose of accurate measurement.