Shearographic Imaging System.
Final rept. 16 Oct 84-16 Dec 86,
UNIVERSITY COLL OF NORTH WALES BANGOR SCHOOL OF ELECTRONIC ENGINEERING SCIENCE
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An optical shearing technique has been used to produce high quality strain contours of centrally loaded, or thermally stressed and clamped plates. An analysis of strain from these fringes provides good agreement between experimental and theoretical values. It has also been shown that this technique is compatible with infrared thermographs in the detection of delamination in a composite laminated plate. The above work was followed by developing an on line electronic speckle shearing technique in which the optical camera was replaced with electronic camera and its associated data storage and analysis and display system. This latter method shows good promise. However, it requires further work and equipments for better image process facilities to improve the fringe resolutions. Author