While for the 3D measurement of non-reflecting surfaces a variety of methods exists, the measurement of reflecting free formed surfaces is still a demanding task. In this paper, an optical measurement technique is presented that, based on an innovative approach of the reflection grating method, allows the direct and unambiguous determination of 3D-coordinates of reflecting surfaces and ― together with the highly accurate photogrammetric combination of numerous single measurements ― may even be used for the 3D measurement of rather complex reflecting surfaces. The calculation of the 3D-coordinates is done by photogrammetric methods based on the observation of a separate pseudo-three-dimensional reference grid structure consisting of an adaptive pattern, depending on the curvature of the object surface, which is evaluated by phase shifting techniques.
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