1 March 1992 Comparison of methods for determining linear birefringence
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Proceedings Volume 1575, 8th Intl Conf on Fourier Transform Spectroscopy; (1992) https://doi.org/10.1117/12.56351
Event: Eighth International Conference on Fourier Transform Spectroscopy, 1991, Lubeck-Travemunde, Germany
Abstract
For the determination of the ordinary and extraordinary refractive indices of nematic liquid crystals in the infrared spectral region, a refractometer was developed. It is a critical angle refractometer of the Abbe type, basically usable in the range from n equals 1.3 to 1.8 and from 4000 cm-1 to 700 cm-1. The reliability of the measurements is 1 X 10-3 and the spectral resolution is 1.5%. The values of the refractive index derived from the critical angle are used as anchor points for Kramers-Kronig transformation (KKT) of a transmittance spectrum of the compound.
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Peter Lampen, Peter Lampen, Ernst Heiner Korte, Ernst Heiner Korte, A. Blumenberg, A. Blumenberg, "Comparison of methods for determining linear birefringence", Proc. SPIE 1575, 8th Intl Conf on Fourier Transform Spectroscopy, (1 March 1992); doi: 10.1117/12.56351; https://doi.org/10.1117/12.56351
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