Polymer-stabilized liquid crystal indicator used in thermometry |
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Authors: | G. Diankov H. Naradikian T. Angelov |
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Affiliation: | 1. Laboratory “Optics and Spectroscopy”, Institute of Solid State Physics, Bulgarian Academy of Sciences, Blvd. Tzarigradsko Chaussee 72, 1784, Sofia, Bulgaria 2. Laboratory “Biomolecular Layers”, Bulgarian Academy of Sciences, Blvd. Tzarigradsko Chaussee 72, 1784, Sofia, Bulgaria
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Abstract: | Research on the biological effects and on critical-temperature alarm indicators for fire safety often requires the use of non-metallic and reliable temperature sensors. For such applications, we investigated the temperature dependence of the spectral response of a pure cholesteric liquid-crystal temperature indicator and of a polymer/liquid crystal mixture. We observed a modulation of the intensity of transmitted monochromatic light, in accordance with the temperature changes. We emphasize that the modulation occurs over a wide temperature range outside the active temperature of the thermochromic liquid-crystal indicator. Such behavior suggests the possibility of using these liquid crystals in a wider temperature range, under appropriate conditions. The spectral response of the liquid crystal in its active temperature range shows that a thermochromic liquid crystal indicator may be practically used as a precision thermometer. |
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