Optical Fringe Analysis Techniques.

摘要

The use of specklegrams for performing certain types of NDI and NDT has been known for some time yet a method for extracting the data quickly and cheaply has eluded specklegram users. This report discusses a new technique for performing the data reduction of the large amounts of data obtained through speckle interferograms. This new technique correlates an optical mask on a fringe pattern to generate a single line scale proportional to the frequency of the cosine fringe pattern when integrated orthogonally to the fringe line. (Author)