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Sensors 2016, 16(5), 699;

A Novel Method for Proximity Detection of Moving Targets Using a Large-Scale Planar Capacitive Sensor System

1,2,* , 1,2
School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China
Science and Technology on Electromechanical dynamic Control Laboratory, Beijing Institute of Technology, Beijing 100000, China
National Key Laboratory of Electronic Measurement Technology, North University of China, Taiyuan 030051, China
Author to whom correspondence should be addressed.
Academic Editors: Changzhi Li, Roberto Gómez-García and José-María Muñoz-Ferreras
Received: 24 February 2016 / Revised: 18 April 2016 / Accepted: 10 May 2016 / Published: 16 May 2016
(This article belongs to the Special Issue Non-Contact Sensing)
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A novel method for proximity detection of moving targets (with high dielectric constants) using a large-scale (the size of each sensor is 31 cm × 19 cm) planar capacitive sensor system (PCSS) is proposed. The capacitive variation with distance is derived, and a pair of electrodes in a planar capacitive sensor unit (PCSU) with a spiral shape is found to have better performance on sensitivity distribution homogeneity and dynamic range than three other shapes (comb shape, rectangular shape, and circular shape). A driving excitation circuit with a Clapp oscillator is proposed, and a capacitance measuring circuit with sensitivity of 0.21 V p p / pF is designed. The results of static experiments and dynamic experiments demonstrate that the voltage curves of static experiments are similar to those of dynamic experiments; therefore, the static data can be used to simulate the dynamic curves. The dynamic range of proximity detection for three projectiles is up to 60 cm, and the results of the following static experiments show that the PCSU with four neighboring units has the highest sensitivity (the sensitivities of other units are at least 4% lower); when the attack angle decreases, the intensity of sensor signal increases. This proposed method leads to the design of a feasible moving target detector with simple structure and low cost, which can be applied in the interception system. View Full-Text
Keywords: moving target; proximity detection; planar capacitive sensor; sensitivity distribution moving target; proximity detection; planar capacitive sensor; sensitivity distribution

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Ye, Y.; Deng, J.; Shen, S.; Hou, Z.; Liu, Y. A Novel Method for Proximity Detection of Moving Targets Using a Large-Scale Planar Capacitive Sensor System. Sensors 2016, 16, 699.

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