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Sensors 2014, 14(4), 6571-6583; doi:10.3390/s140406571

A Novel High-Sensitivity, Low-Power, Liquid Crystal Temperature Sensor

1
Display and Photonic Applications Group, Electronic Technology Department, Carlos III University, Butarque 15, 28911 Leganés, Madrid, Spain
2
CEMDATIC, ETSI, Polytechnic University of Madrid, Ciudad Universitaria, 28040 Madrid, Spain
3
Institute of Applied Physics, Military University of Technology, Kaliskiego 2, 00-908 Warsaw, Poland
*
Author to whom correspondence should be addressed.
Received: 13 March 2014 / Revised: 2 April 2014 / Accepted: 3 April 2014 / Published: 9 April 2014
(This article belongs to the Section Physical Sensors)
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Abstract

A novel temperature sensor based on nematic liquid crystal permittivity as a sensing magnitude, is presented. This sensor consists of a specific micrometric structure that gives considerable advantages from other previous related liquid crystal (LC) sensors. The analytical study reveals that permittivity change with temperature is introduced in a hyperbolic cosine function, increasing the sensitivity term considerably. The experimental data has been obtained for ranges from −6 °C to 100 °C. Despite this, following the LC datasheet, theoretical ranges from −40 °C to 109 °C could be achieved. These results have revealed maximum sensitivities of 33 mVrms/°C for certain temperature ranges; three times more than of most silicon temperature sensors. As it was predicted by the analytical study, the micrometric size of the proposed structure produces a high output voltage. Moreover the voltage’s sensitivity to temperature response can be controlled by the applied voltage. This response allows temperature measurements to be carried out without any amplification or conditioning circuitry, with very low power consumption. View Full-Text
Keywords: temperature sensors; liquid crystals; microstructure temperature sensors; liquid crystals; microstructure
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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

Algorri, J.F.; Urruchi, V.; Bennis, N.; Sánchez-Pena, J.M. A Novel High-Sensitivity, Low-Power, Liquid Crystal Temperature Sensor. Sensors 2014, 14, 6571-6583.

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