A new analysis system for computerbased fringe interpretation is decribed. The principle of the evaluation is based on intensity measurements in the image-plane and a combined phase shift technique. The evaluation technique offers some essential advantages. - suitable for CW- and Pulse-Laser - data evaluation by optical preprocessing and an image an-lyzing system - digitizing of the interferogram in up to 512 x 512 picture elements with 756 grey levels - calculation of the object-deformation or the vibration amplitude for the complete image with high accuracy - no sign ambiguity - help text supported user-software The data output is made in coordinates, in false colour graphics and in pseudo 31)-plots. The applications are demonstrated on vibration modes of automobile components, excited by running engines with the aim of noise reduction, on deformation analysis of static problems and on non destructive tested parts.
"Holographic Applications Of Computer-Based Fringe Interpretation", Proc. SPIE 0599, Optics in Engineering Measurement, (16 July 1986); doi: 10.1117/12.952359; https://doi.org/10.1117/12.952359