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Abstract
A theoretical treatment of the shape of Fizeau fringes crossing a multilayer fibre of kidney-shaped cross-section is presented. A mathematical expression is derived and used to estimate the refractive indices and the birefringence of Dralon-K polyacrylonitrile fibre. Variation of refractive index with temperature is reported. The resulting data were utilized to calculate the polarizability per unit volume for each layer.
Applications are reported in which multiple-beam Fizeau fringes in transmission and reflexion were used, and SEM was employed to estimate the geometrical parameters of the cross-section. Good agreement between the theoretical and experimental results is found.