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Sensors 2016, 16(2), 165;

New C4D Sensor with a Simulated Inductor

State Key Laboratory of Industrial Control Technology, College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 9 December 2015 / Revised: 9 January 2016 / Accepted: 22 January 2016 / Published: 27 January 2016
(This article belongs to the Section Physical Sensors)
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A new capacitively coupled contactless conductivity detection (C4D) sensor with an improved simulated inductor is developed in this work. The improved simulated inductor is designed on the basis of the Riordan-type floating simulated inductor. With the improved simulated inductor, the negative influence of the coupling capacitances is overcome and the conductivity measurement is implemented by the series resonance principle. The conductivity measurement experiments are carried out in three pipes with different inner diameters of 3.0 mm, 4.6 mm and 6.4 mm, respectively. The experimental results show that the designs of the new C4D sensor and the improved simulated inductor are successful. The maximum relative error of the conductivity measurement is less than 5%. Compared with the C4D sensors using practical inductors, the measurement accuracy of the new C4D sensor is comparable. The research results also indicate that the adjustability of a simulated inductor can reduce the requirement for the AC source and guarantee the interchangeableness. Meanwhile, it is recommended that making the potential of one terminal of a simulated inductor stable is beneficial to the running stability. Furthermore, this work indirectly verifies the possibility and feasibility of the miniaturization of the C4D sensor by using the simulated inductor technique and lays a good foundation for future research work. View Full-Text
Keywords: capacitively coupled contactless conductivity detection (C4D); contactless conductivity detection (CCD); series resonance; simulated inductor; conductivity measurement capacitively coupled contactless conductivity detection (C4D); contactless conductivity detection (CCD); series resonance; simulated inductor; conductivity measurement

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Lyu, Y.; Ji, H.; Yang, S.; Huang, Z.; Wang, B.; Li, H. New C4D Sensor with a Simulated Inductor. Sensors 2016, 16, 165.

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