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


Autoria(s): Algorri Genaro, José Francisco; Urruchi del Pozo, Virginia; Bennis, Noureddine; Sánchez Pena, José Manuel
Data(s)

01/04/2014

Resumo

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.

Formato

application/pdf

Identificador

http://oa.upm.es/37395/

Idioma(s)

eng

Publicador

E.T.S.I. Telecomunicación (UPM)

Relação

http://oa.upm.es/37395/1/INVE_MEM_2014_191665.pdf

http://www.mdpi.com/1424-8220/14/4/6571

S2009/ESP-1781

TEC2009-13991-C02-01

info:eu-repo/semantics/altIdentifier/doi/10.3390/s140406571

Direitos

http://creativecommons.org/licenses/by-nc-nd/3.0/es/

info:eu-repo/semantics/openAccess

Fonte

Sensors, ISSN 1424-8220, 2014-04, Vol. 14, No. 4

Palavras-Chave #Telecomunicaciones
Tipo

info:eu-repo/semantics/article

Artículo

PeerReviewed