| 孙斌,倪爽,朱青,陈小惠.低耦合电磁式电导率测量系统的传感器优化设计[J].电子测量与仪器学报,2024,38(2):131-138 |
| 低耦合电磁式电导率测量系统的传感器优化设计 |
| Sensor optimization design of low coupling electromagneticconductivity measurement system |
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| DOI： |
| 中文关键词: 低电导率 磁致伸缩 优化参数 |
| 英文关键词:low conductivity magnetostrictive optimal parameters |
| 基金项目:装备预研重点实验室基金(6142207210202)项目资助 |
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| Author | Institution |
| Sun Bin | School of Automation, Nanjing University of Posts and Telecommunications, Nanjing 210046,China |
| Ni Shuang | School of Automation, Nanjing University of Posts and Telecommunications, Nanjing 210046,China |
| Zhu Qing | School of Automation, Nanjing University of Posts and Telecommunications, Nanjing 210046,China |
| Chen Xiaohui | School of Automation, Nanjing University of Posts and Telecommunications, Nanjing 210046,China |
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| 摘要点击次数: 465 |
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| 中文摘要: |
| 针对电磁式电导率传感器在低电导率测量下的优化设计问题,分析了电磁式电导率传感器的工作原理并构建了物理模型,考虑激励信号参数、磁芯尺寸、磁芯间距、激励线圈匝数和接收线圈匝数对输出电压的影响,改进现有的电磁式电导率测量模型,同时考虑激励频率的多重性,即激励频率直接影响输出电压,又通过磁致伸缩效应改变磁芯磁导率来影响输出电压。采用实验与理论相对比的方法,对频率、间距、匝数等主要参数进行理论分析,得知存在最佳频率段使得输出电压不随频率的波动产生较大的变化,通过改变间距降低两个磁芯间的耦合电压,提高有效信号占比,实现更高的精确度。并通过实验验证证明了理论模型的准确性。采用优化后的参数来设计电导率探头,配置了电导率标准液用于数据拟合,与德国宝德电导率仪进行对比实验,计算Pearson相关系数,证明了优化模型的准确性与高可靠性。 |
| 英文摘要: |
| This paper addresses the optimization design problem of electromagnetic conductivity sensors for low conductivity measurements. The working principle of electromagnetic conductivity sensors is analyzed, and a physical model is constructed. The influence of excitation signal parameters, magnetic core dimensions, core spacing, excitation coil turns, and receiver coil turns on the output voltage is considered. An improved model for electromagnetic conductivity measurement is proposed, taking into account the multiplicity of excitation frequencies. Specifically, the excitation frequency directly affects the output voltage and also modifies the magnetic permeability of the core through the magnetostrictive effect, thereby influencing the output voltage. Theoretical analyses of the main parameters, such as frequency, spacing, and turns, are conducted using a comparative approach with experimental results. It is found that it exists an optimal frequency range where the output voltage remains relatively stable despite fluctuations in frequency. By adjusting the spacing between the two magnetic cores, coupling voltage between them is reduced, resulting in a higher proportion of effective signals and improved accuracy. The accuracy of the theoretical model is verified through experimental validation. Furthermore, the optimized parameters are employed in the design of a conductivity probe, which is calibrated using conductivity standard solutions. Comparative experiments are conducted with a German-made conductivity meter from Bode to calculate the Pearson correlation coefficient, demonstrating the accuracy and high reliability of the optimized model. |
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