The changes of cross-sectional area and refractive-index profile of ‘Terylene’ polyester fibres after stretching have been studied. The cross-sectional shape is determined from the diffraction pattern of a HeNe laser beam. Multiple-beam Fizeau fringes in transmission are used to determine the refractive index profile of these fibres at different draw ratios. A microstrain device connected to a wedge interferometer is utilized for this purpose. Microinterferograms are given for illustration.
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Hamza et al. (1992) studied this question.
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