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Multiplication and extraction of isochromatics from color photoelastic fringes obtained in plane polariscope

This study deals with a method for multiplying and extracting continuous isochromatics from color photoelastic fringes obtained in plane polariscopes with a tricolor light source. In the method, isochromatics are taken using a color CCD camera in dark-and light-field plane polariscopes. The four color images, which contain both isochromatic and isoclinics, for the dark and light fields are used to obtain only color isochromatics. The color isochromatic images are separated into R, G and B images. The number of fringes is trebled when the three color images with extracted fringes of 0.5, 1.5, 2.5,... order are superimposed. In order to investigate the effectiveness of the multiplication and extraction, this method was applied to color photoelastic fringes obtained in an epoxy resin plate under 4-point bending.