Identification of photoelastic parameters through digital image processing and phase shifflng method

Abstract

Phase shifting approaches represents important tools in whole field photoelastic analysis. There are many ways to change the phase of a photoelastic pattern. In this work one uses a four images method that requires only a plane polariscope and frame-grabber devices. Phase unwrapping algorithms, together with image processing routines, such as filtering, blurring and region of interest processing, are used to process photoelastic data. An application to a disc under compression was made.