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In this paper, the temperature characteristics of the helical pitch and the anisotropy of refractive index in cholesteric liquid crystals (CLC) as well as the characteristics: the helical pitch in CLC layers versus the concentrations of vaporous acetone, ethanol and ammonia, are presented. The possibilities of designing devices based on optical properties of liquid crystal planar structures are discussed and an optic planar waveguide, a splitter and an amplifier for a sensor system with optical channel for environment monitoring are proposed.