A novel high-sensitivity, low-power, liquid crystal temperature sensor

Algorri Genaro, José Francisco and Urruchi del Pozo, Virginia and Bennis, Noureddine and Sánchez Pena, José Manuel (2014). A novel high-sensitivity, low-power, liquid crystal temperature sensor. "Sensors", v. 14 (n. 4); pp. 6571-6583. ISSN 1424-8220. https://doi.org/10.3390/s140406571.

Description

Title: A novel high-sensitivity, low-power, liquid crystal temperature sensor
Author/s:
  • Algorri Genaro, José Francisco
  • Urruchi del Pozo, Virginia
  • Bennis, Noureddine
  • Sánchez Pena, José Manuel
Item Type: Article
Título de Revista/Publicación: Sensors
Date: April 2014
ISSN: 1424-8220
Volume: 14
Subjects:
Freetext Keywords: Temperature sensors; liquid crystals; microstructure
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Tecnología Fotónica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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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.

Funding Projects

TypeCodeAcronymLeaderTitle
Madrid Regional GovernmentS2009/ESP-1781UnspecifiedUnspecifiedUnspecified
Government of SpainTEC2009-13991-C02-01UnspecifiedUnspecifiedUnspecified

More information

Item ID: 37395
DC Identifier: http://oa.upm.es/37395/
OAI Identifier: oai:oa.upm.es:37395
DOI: 10.3390/s140406571
Official URL: http://www.mdpi.com/1424-8220/14/4/6571
Deposited by: Memoria Investigacion
Deposited on: 05 Oct 2015 18:21
Last Modified: 05 Oct 2015 18:21
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