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| Electrolytic conductivity meter based on Van Der Pauw theory |
| YU Xiang1, ZHANG Bing1, LIN Zhen2, ZHANG Xiao2, WEI Jia-li1, WANG Xiao-ping1 |
| 1. State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering and Information Science, Zhejiang University, Hangzhou 310027, China;2. Zhejiang Province Institute of Metrology, Hangzhou 310013, China |
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Abstract In order to realize the accurate measurement for electrolytic conductivity of water, the principle of Van Der Pauw and its theoretical basis applied for absolute measurement electrolytic conductivity were studied, then the four-electrode with an axial-radial two-dimensional adjustment structure was designed. Through a series of experiments and analysis, the symmetrical electrodes and the closed conductivity cell can guarantee a high precision measurement result, and can also be achieved the absolute measurement. The conductance cell constant was only depended on the length of the electrode, several electrodes with different length, were designed, and the appropriate measurement range for each cell constant was also given. Finally, chose the electrode whose cell constant is 0.1 cm-1 to measure several actual samples with the conductivity range of 20~500 μS/cm, the relative errors are all less than 1.0%. The Van Der Pauw theory applied to the absolute measurement of the electrolytic conductivity, provides a well application prospect and popularization value.
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Published: 01 February 2015
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基于Van Der Pauw原理的溶液电导率计
为实现对于电导率的准确测量,研究Van Der Pauw原理及其应用于电导率绝对测量的理论依据,设计径轴二维可调的四电极结构.分析电极的对称性、电导池的封闭性对测量结果的影响,实验结果证明对称性好、结构封闭的Van Der Pauw法电导率计,对溶液电导率具有较高的测量精度,并能够实现绝对测量.基于Van Der Pauw法的电导池常数κ仅与电极长度有关的原则,设计几种不同电极长度的电极,开展多种不同电导率溶液的测量实验,得出不同电导池常数κ的最佳测量范围.运用电导池常数为0.1 cm-1的电极,对电导率为20~500 μS/cm内的多个实际水样进行测量,相对误差小于1.0%.结果表明该新型电导率测量方法具有很好的应用前景和推广价值.
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