Shearography has been proved highly effective for nondestructive testing (NDT), especially for NDT of composite materials used in the automotive, aerospace engineering. Although its application in material testing and material research already has achieved more and more acceptance in research and by industry, its applications are mainly limited to inspect and test an object surface which can directly be observed by a shearographic camera. Its application is mainly limited to the inspection and testing an object surface that can directly be observed by a shearographic camera. It is impossible to inspect an internal surface of a container. If the reflected light of the surface, which has to be examined, can't reach the shearographic camera there is still no inspection possible. This paper presents the development of a shearographic endoscope. The development enabled shearographic inspection of both external and internal surfaces of objects to be studied. The principles and methodology of shearographic endoscope are described. The measuring sensitivity, a method for eliminating the fish-eye-effect, and an application example are presented.
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