AbstractThe availability of a simple experimental technique for determining the three principal refractive indices of an anisotropic film (here defined as the trirefringence technique) makes possible a wide range of optical criteria for evaluating property and processing variables. The present study considers different applications of the refractive index information in order to show the versatility and practical utility of the technique. For example, a normalization procedure is developed which determines equivalent optical anisotropic states of films. This allows films produced by different multiaxial fabrication processes to be compared. Similarly, procedures are described for characterizing the crystallinity, the angular optical distribution in the plane of the film, and other interesting applications of the refractive index information.
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