Title :
Modal liquid crystal temperature sensor
Author :
Algorri, J.F. ; Lallana, P.C. ; Urruchi, V. ; SaÌnchez-Pena, J.M.
Author_Institution :
Electron. Technol. Dept., Carlos III Univ. of Madrid, Leganes, Spain
Abstract :
In this work, a novel liquid crystal temperature sensor is proposed. This sensor is composed by only two electrodes. A simple and easily scalable structure uses the temperature dependence of the liquid crystal permittivity as the sensing magnitude. The sensor has a high sensitivity, low voltage control, low power consumption and high linearity. The analytical modelling allows an optimization of the structure, in terms of sensitivity. Several liquid crystal has been investigated. The response improves the characteristics of previous LC sensors and even some commercial sensors (e.g. 60 mV/°C for 10 Vrms of applied voltage, six times more than of most silicon temperature sensors).
Keywords :
liquid crystal devices; permittivity; temperature sensors; LC sensors; liquid crystal permittivity; modal liquid crystal temperature sensor; optimization; sensing magnitude; Electrodes; Permittivity; Sensitivity; Temperature measurement; Temperature sensors; Voltage measurement; Temperature sensing; high resistivity layer; liquid crystal;
Conference_Titel :
SENSORS, 2014 IEEE
Conference_Location :
Valencia
DOI :
10.1109/ICSENS.2014.6985416