Abstract
In this paper we present a further development of a fiber optic method for high hydrostatic pressure sensing utilizing liquid crystalline films as a sensing element. The method exploiting the effect of pressure-induced changes in the wavelength of selective Bragg light reflection observed in ordered layers of a chiral nematic liquid crystal resides in guiding a light beam of predetermined wavelength toward the layers using optical fibers and collecting the light beam reflected by the layers via another of optical fibers. The purpose of the study was to obtain liquid crystalline films which would be particularly sensitive for pressure effects and in which disturbing effects of temperature would be minimized. To achieve this goal two classes of chiral nematic liquid crystal have been investigated: the first class was composed of a nematic liquid crystal and a mixture of three chiral dopants preset for selective Bragg reflection conditions, while the second class was preset for the Mauguin limit to obtain rotation of linear polarization of light coming through the liquid crystalline film. The results indicate that both classes of the investigated liquid crystalline films offer high response to pressure with a minimized temperature sensitivity.
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