Abstract
We report the further development, as a student project, of a liquid crystal evaluation system. Improvements to the existing system include illumination via a fibre optic bundle, selection of a range of wavelengths for illumination, the redesign of the electronic interface box into a modular system, micropositioner control for better alignment of the liquid crystal sample in relation to the probe head, the incorporation of a heating and cooling stage, much improved frequency range and resolution, much improved voltage resolution, automatic gain control, and the incorporation of cushion contacts for the test cells making them more robust and easier to handle. Polarization plots for a representative sample of liquid crystal are presented, as well as the response under different spectral illumination and at different temperatures.
Published Version
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