New numerical method for the photoelastic technique

the objective of this research is to find new equations for a novel phase-shifting method in digital photoelasticity. some innovations are proposed. in terms of phase-shifting, only the analyzer is rotated, and the other equations are deduced by applying a new numerical technique instead of the usual algebraic techniques. this approach can be used to calculate a larger sequence of images. each image represents a measurement of the stresses present in the object. every photographic image has errors and random noise, but the uncertainties due to these effects can be reduced with a larger number of observations.