Mathematical expressions are derived for the shape of multiple-beam Fizeau fringes and the associated white-light fringes of equal chromatic order crossing a fiber of circular cross section having a core surrounded by a skin. Formulas are obtained for calculating the refractive indices of the core from fringe shifts. A formula is deduced for a fiber having a single medium. An expression for the focal power of a cylindrical fiber is derived and the focal aberration across it is calculated.A study was made of the influence of temperature on the kinetics of the desorption of disperse dyes on polyester of different deniers. Activating energies were determined and, from the theory of absolute rates, related to both diffusion and kinetics, we measured the activating free energies and the activating entropies. Similar results were obtained for both.
Interferometric determination of the principal refractive indices for light vibrating parallel and perpendicular to the fiber axis and the birefringence for Acrilan® have been carried out. Multiple-beam Fizeau fringes in transmission were used for fibers of irregular cross sections. A new method suitable for evaluating small birefringence in fibers was applied. Variation of refractive index with temperature was also determined. The fringes of equal chromatic order were applied for determining the birefringence of the fibers with diameters of 15-40 microns.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.