Investigation of Weakly Oriented Polymeric Objects by Extended Fringe Field Interference Method

Abstract

An extended interferometric method is suggested to increase the measuring accuracy of the spectral dispersion curves of weakly oriented polymeric objects. This extended method is based on the variable-wavelength interferometry fringe field interference (VAWIFFI). Using this method, the calculation of the initial interference order is more accurate, and it can be determined over a small range of the visible spectrum. The advantage of the extended VAWIFFI method is that it is not necessary to take a certain reference like the zero order fringe and/or the initial coincident configuration. In comparison to the single-and multi-fringe VAWIOFT and Pluta methods, the measurement accuracy of the extended VAWIFFI method is discussed.