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Proceedings 2017, 1(4), 395; doi:10.3390/proceedings1040395

Contactless Interrogation System for Capacitive Sensors with Time-Gated Technique

Department of Information Engineering, University of Brescia, 25123 Brescia, Italy
Presented at the Eurosensors 2017 Conference, Paris, France, 3–6 September 2017.
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Published: 8 August 2017
(This article belongs to the Proceedings of Eurosensors 2017)
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Abstract

This paper presents a measurement technique and system for the contactless interrogation of capacitive sensors via electromagnetic coupling. The interrogation unit employs a primary coil to periodically excite the capacitive sensor connected to a secondary coil forming an LC resonant circuit. When the excitation to the primary coil is switched off the damped response of the LC circuit is detected. As a fundamental advantage compared to techniques based on reflected impedance, this approach ensures that the readout frequency is to first order independent of the interrogation distance between the two coils. The system has been tested with reference capacitors and with a capacitive liquid level sensor. The experimental results are in a good agreement with theoretical expectations and show a sensitivity of about −23 kHz/pF at 5.4 MHz and the possibility to operate with interrogation distances up to few centimeters.
Keywords: distance-independent contactless interrogation; capacitive sensors; LC resonant circuit; time-gated technique distance-independent contactless interrogation; capacitive sensors; LC resonant circuit; time-gated technique
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. (CC BY 4.0).

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MDPI and ACS Style

Masud, M.; Baù, M.; Demori, M.; Ferrari, M.; Ferrari, V. Contactless Interrogation System for Capacitive Sensors with Time-Gated Technique. Proceedings 2017, 1, 395.

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