Abstract
The polarizing interference microscope is used with a fibre manipulation device to study, dynamically, the variation of refractive indices and birefringence of PE fibres with the draw ratio. The resulting data were used to calculate Poisson's ratio over all strain ranges. In addition, the strain optical coefficient and some other parameters and constants were calculated. Also, an empirical formula is applied to demonstrate the variation of the cross-sectional area of PE fibres with draw ratio and the constants of this formula are determined. Microinterfrograms are given for illustration.
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