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Sensors 2018, 18(10), 3436; https://doi.org/10.3390/s18103436

Wireless Temperature Sensor Based on a Nematic Liquid Crystal Cell as Variable Capacitance

Displays and Photonic Applications Group (GDAF-UC3M), Electronic Technology Department, Carlos III University of Madrid, Av de la Universidad 30, E28911 Leganés, Spain
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Received: 17 September 2018 / Revised: 10 October 2018 / Accepted: 10 October 2018 / Published: 12 October 2018
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Spain 2018)
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Abstract

Wireless communication is growing quickly and now allows technologies like the Internet of Things (IoT). It is included in many smart sensors helping to reduce the installation and system costs. These sensors increase flexibility, simplify deployment and address a new set of applications that was previously impossible with a wired approach. In this work, a wireless temperature sensor based on a nematic liquid crystal as variable capacitance is proposed as a proof of concept for potential wearable applications. Performance analysis of the wireless temperature sensor has been carried out and a simple equivalent circuit has been proposed. Sensor prototype has been successfully fabricated and demonstrated as the beginning of new biomedical sensors. View Full-Text
Keywords: nematic liquid crystal; impedance analysis; temperature dependence; equivalent circuit; capacitive sensor; simulation nematic liquid crystal; impedance analysis; temperature dependence; equivalent circuit; capacitive sensor; simulation
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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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Torres, J.C.; García-Cámara, B.; Pérez, I.; Urruchi, V.; Sánchez-Pena, J.M. Wireless Temperature Sensor Based on a Nematic Liquid Crystal Cell as Variable Capacitance. Sensors 2018, 18, 3436.

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