Temperature-Phase Converter Based on a LC Cell as a Variable Capacitance

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dc.contributor.author Torres Zafra, Juan Carlos
dc.contributor.author García Cámara, Braulio
dc.contributor.author Pérez Garcilópez, Antonia Isabel
dc.contributor.author Urruchi del Pozo, Virginia
dc.contributor.author Sanchez Pena, Jose Manuel
dc.date.accessioned 2019-01-17T11:15:31Z
dc.date.available 2019-01-17T11:15:31Z
dc.date.issued 2015-03-06
dc.identifier.bibliographicCitation Torres, J.C., García-Cámara, B., Pérez, I., Urruchi, V., Sánchez-Pena, J.M. (2015). Temperature-Phase Converter Based on a LC Cell as a Variable Capacitance. Sensors, 15 (3), pp. 5594-5608.
dc.identifier.issn 1424-8220
dc.identifier.uri http://hdl.handle.net/10016/27928
dc.description.abstract The main characteristic of liquid crystals is that their properties, both electrical and optical, can be modified through a convenient applied signal, for instance a certain voltage. This tunable behavior of liquid crystals is directly related to the orientation of their nanometric components with respect to a director direction. However, the initial alignment is a fabrication-dependent parameter and may be either planar or homeotropic. In addition, the strong dependence of the properties of liquid crystals with the temperature is well known and widely used for several temperature sensors. This dependence is produced by the influence of the temperature on the ordering of the molecules. In this work, we have studied the temperature dependence of the electric properties of a liquid crystal cell, in particular the dielectric permittivity, with the temperature as a function of the initial alignment set during the fabrication process. Starting from experimental measurements, an equivalent circuit model including the temperature dependence has been proposed. We have observed that a good linearity in a wide temperature range is provided at a suitable exciting frequency. Finally, a proper conditioner circuit is proposed as a powerful tool for linear and high sensibility temperature measurement.
dc.description.sponsorship This work was supported by the Ministerio de Economía y Competitividad of Spain (grant No. TEC2013-47342-C2-2-R) and Comunidad de Madrid (SINFOTON-CM, reference P2013/MIT-2790).
dc.format.extent 17
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher MDPI
dc.rights © 2015 by the authors; licensee MDPI, Basel, Switzerland.
dc.rights Atribución-NoComercial-SinDerivadas 3.0 España
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject.other Nematic liquid crystal
dc.subject.other Impedance analysis
dc.subject.other Temperature dependence
dc.subject.other Equivalent circuit
dc.subject.other Capacitive sensor
dc.subject.other Simulation
dc.title Temperature-Phase Converter Based on a LC Cell as a Variable Capacitance
dc.type article
dc.subject.eciencia Electrónica
dc.subject.eciencia Ingeniería Industrial
dc.identifier.doi https://doi.org/10.3390/s150305594
dc.rights.accessRights openAccess
dc.relation.projectID Gobierno de España. TEC2013-47342-C2-2-R
dc.relation.projectID Comunidad de Madrid. P2013/MIT-2790/SINFOTON
dc.type.version publishedVersion
dc.identifier.publicationfirstpage 5594
dc.identifier.publicationissue 3
dc.identifier.publicationlastpage 5608
dc.identifier.publicationtitle Sensors
dc.identifier.publicationvolume 15
dc.identifier.uxxi AR/0000016920
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