Inverse projected-fringe technique with automatic pattern adaption using a programmable spatial light modulator

Michael K. Kalms; Wolfgang Osten; Werner P. O. Jueptner

doi:10.1117/12.323360

29 September 1998 Inverse projected-fringe technique with automatic pattern adaption using a programmable spatial light modulator

Michael K. Kalms, Wolfgang Osten, Werner P. O. Jueptner

Author Affiliations +

Proceedings Volume 3407, International Conference on Applied Optical Metrology; (1998) https://doi.org/10.1117/12.323360
Event: International Conference on Applied Optical Metrology, 1998, Balatonfured, Hungary

Abstract

This paper deals with a new active technology in optical shape measurement called inverse projected-fringe-technique. Using a programmable liquid crystal spatial light modulator (LCD- SLM) with digital pixel control a precise sinusoidal grating with arbitrary topology can be created and projected onto the object under test. In this case the grating can be adapted to the shape of the object not only to overcome possible problematic areas such as saturated regions and nonresolved fringes but to generate also a so called inverse pattern that causes straight and uniform fringes on the object if it is observed by the camera. This technique is of special advantage for shape control in the production line since only certain deviations from the uniform pattern have to be detected if the object has to be classified as good or bad. In that case a fast optical correlator can be used that needs almost the same simple filter mask for a broad variety of test objects.

Citation Download Citation

Michael K. Kalms, Wolfgang Osten, and Werner P. O. Jueptner "Inverse projected-fringe technique with automatic pattern adaption using a programmable spatial light modulator", Proc. SPIE 3407, International Conference on Applied Optical Metrology, (29 September 1998); https://doi.org/10.1117/12.323360

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