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Microscopic transmission ellipsometry: measurement of the fibril angle and the relative phase retardation of single, intact wood pulp fibers

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Abstract

A new technique based on transmission intensity-quotient ellipsometry has been developed for determining the fibril angle and the relative phase retardation of single, intact pulp fibers. The method uses a polarizing microscope in conjunction with a microscope video camera or CCD camera. Requiring no sample pretreatment, the new method is simple, fast, more accurate than existing methods, and nondestructive of the fiber material. To test the new method, we employed the multiwavelength measurement principle. It is based on the fact that the fibril angle is independent of wavelength, while the relative retardation is inversely proportional to the wavelength used. Measurements were carried out with single pulp fibers as samples under the illumination of different light wavelengths. The measurements and some results are described and presented.

© 1994 Optical Society of America

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