Abstract
Three different techniques, the Becke-line method, two beam-interference microscopy, and the application of multiple-beam Fizeau fringes in transmission and reflection, were used to measure the refractive indices for light vibrating parallel and perpendicular to the axis of regular and irregular cross sections. The fibers were bicomponent (nylon 6 and 66), Perlon (polyamide 6), and nylon 6 fibers from an Egyptian manufacturer. Two different formulas were used to determine the indices of refraction for each layer of inhomogeneous fibers. The birefringence and Cauchy constants were also determined. This experimental work demonstrates the potential applications of these two mathematical formulas to obtain accurate results. The advantages of the methods are discussed using microinterferograms.
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