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An Optical Method for the Determination of the Cholesteric Pitch in Liquid Crystals

机译:测定液晶中胆固醇间距的光学方法

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摘要

Preparation of a cholesteric liquid crystalline phase in planar orienting liquid crystal cells exhibits discontinuous colour changes with temperature when viewed between crossed polarizers. The transmission spectra of such a system can be described by a modified de Vries equation, with the birefringence dispersion included in a simplified single-band model. With a suitable choice of the cell gap as compared to the cholesteric pitch, the procedure can be used as a new method to determine the temperature dependence of the cholesteric pitch.
机译:当在正交偏振器之间观察时,在平面取向液晶盒中胆甾型液晶相的制备显示出随温度的不连续颜色变化。这种系统的透射光谱可以用改进的de Vries方程描述,双折射色散包括在简化的单波段模型中。与胆甾型沥青相比,通过适当选择单元间隙,可以将该程序用作确定胆甾型沥青的温度依赖性的新方法。

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