| Citation: | SONG Yue, CHANG Ya, JI Haifeng, et al. Design and optimization of a new type of contactless radial C4D sensor[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(2): 375-380. doi: 10.13700/j.bh.1001-5965.2016.0108(in Chinese)
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Based on capacitively coupled contactless conductivity detection (C4D) technology, a new contactless conductivity sensor with radial structure is designed and developed. Series resonance principle is used to overcome the unfavourable influence of the coupling capacitances by introducing an inductor. Since the background signal produced by the coupling capacitances can be eliminated, the measurement range of the developed radial C4D sensor is extended, and the measurement sensitivity is improved. The electrode angle of the new radial C4D sensor is optimized by the simulation results and experimental results. In order to verify the effectiveness of the developed sensor, conductivity measurement experiments are carried out in five insulated pipes with different inner diameters of 5.0, 7.5, 9.1, 10.2 and 12.0 mm respectively, and the relative error of conductivity measurement is less than 5%. The experimental results show that the developed contactless conductivity sensor is feasible and effective.
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