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Display and Photonic Applications Group, Electronic Technology Department, Carlos III University, Butarque 15, 28911 Leganés, Madrid, Spain


CEMDATIC, ETSI, Polytechnic University of Madrid, Ciudad Universitaria, 28040 Madrid, Spain


Institute of Applied Physics, Military University of Technology, Kaliskiego 2, 00-908 Warsaw, Poland


Author to whom correspondence should be addressed.

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

Autor: José Francisco Algorri 1,* , Virginia Urruchi 1, Noureddine Bennis 2,3 and José Manuel Sánchez-Pena 1

Fuente: http://mdpi.com/


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