The technique of image derotation allows a variety of measurements to be made on rotating components by optically compensating for their rotational motion. A description is given of a novel technique required to achieve the high level of alignment accuracy necessary for the successful implementation of holographic interferometry and laser doppler velocimentry in conjunction with the image derotator. Several recent industrial applications in the gas turbine and automobile industries are described.
W. F. Fagan,
"Industrial Applications Of Image Derotation", Proc. SPIE 0398, Industrial Applications of Laser Technology, (26 October 1983); doi: 10.1117/12.935375; https://doi.org/10.1117/12.935375