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Advances in Mathematical Physics
Volume 2015, Article ID 437869, 9 pages
Research Article

Coupling Influence on Signal Readout of a Dual-Parameter LC Resonant System

1Key Laboratory of Instrumentation Science & Dynamic Measurement, Ministry of Education, North University of China, Tai Yuan 030051, China
2Science and Technology on Electronic Test & Measurement Laboratory, North University of China, Tai Yuan 030051, China
3State Key Laboratory of Transducer Technology, Department of Precision Instrument and Mechanology, Tsinghua University, Beijing 10084, China

Received 1 February 2015; Accepted 3 May 2015

Academic Editor: Mikhail Panfilov

Copyright © 2015 Jijun Xiong et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Dual-parameter inductive-capacitive (LC) resonant sensor is gradually becoming the measurement trend in complex harsh environments; however, the coupling between inductors greatly affects the readout signal, which becomes very difficult to resolve by means of simple mathematical tools. By changing the values of specific variables in a MATLAB code, the influence of coupling between coils on the readout signal is analyzed. Our preliminary conclusions underline that changing the coupling to antenna greatly affects the readout signal, but it simultaneously influences the other signal. When , it is better to broaden the difference between the two coupling coefficients and . On the other side, when is smaller than , it is better to decrease the coupling between sensor inductors , in order to obtain two readout signals averaged in strength. Finally, a test system including a discrete capacitor soldered to a printed circuit board (PCB) based planar spiral coil is built, and the readout signals under different relative inductors positions are analyzed. All experimental results are in good agreement with the results of the MATLAB simulation.