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Shearography is an optical technique developed for full-field measurement of surface deformation. It has since been accepted by industry as a practical nondestructive testing technique for evaluating the structural integrity of components and structures. Qualitatively, shearography reveals flaws from flaw-induced, anomalous deformation in the component under inspection, and quantitatively, shearography assesses the detected flaws through back-calculation from the anomalous deformation. This paper demonstrates that, with the use of multiple-frequency acoustical excitation together with the time-integrated shearographic recording technique, rapid and automated assessment of the integrity of adhesive-bonded composite structures can be realized in the actual plant environment.

Two three-dimensional computer vision schemes will be presented, one for diffusely reflective surfaces, and the other for specularly reflective surfaces. Both techniques are based on the marriages of optical techniques and computer image processing algorithms which allow full-field precision measurement of surface depth. The techniques can also be used for inspecting surface quality of car bodies.