A novel high-sensitivity, low-power, liquid crystal temperature sensor
Ver/ Abrir
Registro completo
Mostrar el registro completo DCAutoría
Algorri Genaro, José Francisco; Urruchi del Pozo, Virginia; Bennis, Noureddine; Sánchez Pena, José ManuelFecha
2014-04-09Derechos
© 2014 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license.
Publicado en
Sensors, 2014, 14(4), 6571-6583
Editorial
MDPI
Palabras clave
Temperature sensors
Liquid crystals
Microstructure
Resumen/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.
Colecciones a las que pertenece
- D50 Artículos [277]
- D50 Proyectos de Investigación [361]