A liquid conductivity measurement system based on electromagnetic induction

2015 8th International Conference on Biomedical Engineering and Informatics (BMEI) Pub Date : 2015-10-01 DOI:10.1109/BMEI.2015.7401603

Jing Liu, Li Ke, Qiang Du, Ling Han

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Abstract

Electromagnetic measurement method was a non-contact biological tissue conductivity measurement technology. This paper presented a liquid conductivity measurement system based on electromagnetic induction; phase difference information of induced magnetic field was used as detection signal in the system. Firstly, the system was composed of excitation source based on directly digital synthesis, phase detector based on SR844 RF lock-in amplifier, excitation-detection coils sensor and signal processing circuit. Secondly, the maximum error of exciting source frequency accuracy was 2.4%, the phase drift of system was 0.001° /min, the phase resolution was 0.02°, the minimum conductivity could be detected by this system was 0.004S/m. Finally, the saline solution experiments of different concentration and different kinds of drinking water were made by this system, the experimental results demonstrated that the system could obviously identify category of water, and measurement results were consistent with the theory of electromagnetic field.

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一种基于电磁感应的液体电导率测量系统

电磁测量法是一种非接触式生物组织电导率测量技术。提出了一种基于电磁感应的液体电导率测量系统;系统采用感应磁场的相位差信息作为检测信号。首先，系统由基于直接数字合成的激励源、基于SR844射频锁相放大器的鉴相器、激励检测线圈传感器和信号处理电路组成。其次，激励源频率精度的最大误差为2.4%，系统相漂移为0.001°/min，相分辨率为0.02°，系统可检测的最小电导率为0.004S/m。最后，利用该系统对不同浓度的盐水溶液和不同种类的饮用水进行了实验，实验结果表明，该系统能明显识别水的种类，测量结果与电磁场理论相吻合。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2015 8th International Conference on Biomedical Engineering and Informatics (BMEI)

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