Inverse projected fringe technique

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

doi:10.1117/12.429628

13 June 2001 Inverse projected fringe technique

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

Proceedings Volume 4317, Second International Conference on Experimental Mechanics; (2001) https://doi.org/10.1117/12.429628
Event: Second International Conference on Experimental Mechanics, 2000, Singapore, Singapore

Abstract

A technique is introduced for the shape inspection of workpieces in production lines. This procedure is based ona new active technology in optical shape measurements the so- called inverse projected-fringe-technique. Based on an existing master object or its reconstructed shape an adapted fringe pattern can be computed and projected using a free- programmable LCD-matrix. Such an inverse projection can be used for the comparison between a sample and its master piece in quality control. Having a test object that completely fits in shape with the master piece the inverse projection delivers an equidistant and non-distorted fringe pattern under the same observation direction. However, every faulty object area of the sample causes distortions relatively to this known model and can be consequently detected very fast by means of suitable correlation techniques. Especially the simplicity of the master pattern offers the possibility of very simple filters and evaluation procedures such as the spatial heterodyne-technique.

Citation Download Citation

Michael K. Kalms, Wolfgang Osten, and Werner P. O. Jueptner "Inverse projected fringe technique", Proc. SPIE 4317, Second International Conference on Experimental Mechanics, (13 June 2001); https://doi.org/10.1117/12.429628

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