Liquid Crystal Temperature Sensor Based on Three Electrodes and a High-Resistivity Layer

In this paper, a novel liquid crystal (LC) temperature sensor is proposed and theoretically analyzed. A detailed analytical model has been presented. The sensor is designed and optimized to produce maximum sensitivities. This sensor is composed of only three electrodes. The electrodes are very simple and can be easily designed for different sizes. The structure uses the temperature dependence of the LC permittivity as sensing magnitude. Several LC have been investigated. The response improves the characteristics of previous LC sensors and even some commercial sensors in terms of sensitivity or linearity. The sensor has a high sensitivity, low-voltage control, low power consumption, and high linearity. The main advantage is the possible integration of this sensor in other LC devices.

[2]  A. Schenning,et al.  A Printable Optical Time‐Temperature Integrator Based on Shape Memory in a Chiral Nematic Polymer Network , 2013 .

[3]  Sudhir K. Sastry,et al.  Use of liquid crystals as temperature sensors in food processing research , 1995 .

[4]  Robert H. Chen,et al.  Liquid Crystal Displays: Fundamental Physics and Technology , 2011 .

[5]  Gordon D. Love,et al.  Adaptive modally addressed liquid crystal lenses , 2004, SPIE Optics + Photonics.

[6]  M. Schadt,et al.  Physical properties of new liquid-crystal mixtures and electrooptical performance in twisted nematic displays , 1978, IEEE Transactions on Electron Devices.

[7]  J. F. Algorri,et al.  Note: Electrical modeling and characterization of voltage gradient in liquid crystal microlenses. , 2013, The Review of scientific instruments.

[8]  P. Gennes,et al.  The physics of liquid crystals , 1974 .

[9]  A. P. Mammana,et al.  Electrical modeling of liquid crystal displays-LCDs , 2006, IEEE Transactions on Dielectrics and Electrical Insulation.

[10]  Noureddine Bennis,et al.  Dynamics and Electrooptics of Vertically Aligned Nematics With Induced Pretilt on ${\hbox{SiO}}_{x}$ , 2010, Journal of Display Technology.

[11]  J. F. Algorri,et al.  Modal liquid crystal microaxicon array. , 2014, Optics letters.

[12]  J. F. Algorri,et al.  An Autostereoscopic Device for Mobile Applications Based on a Liquid Crystal Microlens Array and an OLED Display , 2014, Journal of Display Technology.

[13]  R. Dabrowski,et al.  A comparative study of the mesomorphic properties of fluoro-isothiocyanated and fluorinated terphenyl liquid crystals from birefringence, static dielectric permittivity, splay elastic constant and rotational viscosity measurements , 2012 .

[14]  José Francisco Algorri,et al.  A Novel High-Sensitivity, Low-Power, Liquid Crystal Temperature Sensor , 2014, Sensors.

[15]  J. F. Algorri,et al.  Liquid Crystal Temperature Sensor Based on a Micrometric Structure and a Metallic Nanometric Layer , 2014, IEEE Electron Device Letters.

[16]  J. F. Algorri,et al.  Fiber Optic Temperature Sensor Based on Amplitude Modulation of Metallic and Semiconductor Nanoparticles in a Liquid Crystal Mixture , 2015, Journal of Lightwave Technology.

[17]  C. Liao,et al.  Selectively Infiltrated Photonic Crystal Fiber With Ultrahigh Temperature Sensitivity , 2011, IEEE Photonics Technology Letters.

[18]  Akhlesh Lakhtakia,et al.  The physics of liquid crystals, 2nd edition: P.G. De Gennes and J. Prost, Published in 1993 by Oxford University Press, Oxford, UK, pp 7,597 + xvi, ISBN: 0-19-852024 , 1995 .

[19]  Jun Long Lim,et al.  Fabrication and Characterization of a Highly Temperature Sensitive Device Based on Nematic Liquid Crystal-Filled Photonic Crystal Fiber , 2012, IEEE Photonics Journal.

[20]  Juan Carlos Torres,et al.  Temperature-Frequency Converter Using a Liquid Crystal Cell as a Sensing Element , 2012, Sensors.

[21]  J. F. Algorri,et al.  Modal liquid crystal array of optical elements. , 2013, Optics express.

[22]  Hak-Rin Kim,et al.  Electrooptic temperature sensor based on a Fabry-Pe/spl acute/rot resonator with a liquid crystal film , 2006, IEEE Photonics Technology Letters.

[23]  S. Ray,et al.  The effect of substrate temperature on the properties of ITO thin films for OLED applications , 2006 .

[24]  Shin-Tson Wu,et al.  Temperature effect on liquid crystal refractive indices , 2004 .

[25]  Shin‐Tson Wu,et al.  Infrared refractive indices of liquid crystals , 2005 .