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Sensors 2014, 14(8), 14021-14037; doi:10.3390/s140814021

Analytical and Numerical Investigations into Hemisphere-Shaped Electrostatic Sensors

Science and Technology on Integrated Logistics Support Laboratory, National University of Defense Technology, Changsha 410073, China
Author to whom correspondence should be addressed.
Received: 21 March 2014 / Revised: 27 June 2014 / Accepted: 27 June 2014 / Published: 31 July 2014
(This article belongs to the Section Physical Sensors)
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Electrostatic sensors have been widely used in many applications due to their advantages of low cost and robustness. Their spatial sensitivity and time-frequency characteristics are two important performance parameters. In this paper, an analytical model of the induced charge on a novel hemisphere-shaped electrostatic sensor was presented to investigate its accurate sensing characteristics. Firstly a Poisson model was built for electric fields produced by charged particles. Then the spatial sensitivity and time-frequency response functions were directly derived by the Green function. Finally, numerical calculations were done to validate the theoretical results. The results demonstrate that the hemisphere-shaped sensors have highly 3D-symmetrical spatial sensitivity expressed in terms of elementary function, and the spatial sensitivity is higher and less homogeneous near the hemispherical surface and vice versa. Additionally, the whole monitoring system, consisting of an electrostatic probe and a signal conditioner circuit, acts as a band-pass filter. The time-frequency characteristics depend strongly on the spatial position and velocity of the charged particle, the radius of the probe as well as the equivalent resistance and capacitance of the circuit. View Full-Text
Keywords: electrostatic monitoring; hemisphere-shaped sensors; Green function; spatial sensitivity; induced charge electrostatic monitoring; hemisphere-shaped sensors; Green function; spatial sensitivity; induced charge

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Lin, J.; Chen, Z.-S.; Hu, Z.; Yang, Y.-M.; Tang, X. Analytical and Numerical Investigations into Hemisphere-Shaped Electrostatic Sensors. Sensors 2014, 14, 14021-14037.

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