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Proceedings Paper

Inverse projected fringe technique
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Paper 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.

Paper Details

Date Published: 13 June 2001
PDF: 6 pages
Proc. SPIE 4317, Second International Conference on Experimental Mechanics, (13 June 2001); doi: 10.1117/12.429628
Show Author Affiliations
Michael K. Kalms, Bremen Institute of Applied Beam Technology (Germany)
Wolfgang Osten, Bremen Institute of Applied Beam Technology (Germany)
Werner P. O. Jueptner, Bremen Institute of Applied Beam Technology (Germany)

Published in SPIE Proceedings Vol. 4317:
Second International Conference on Experimental Mechanics
Fook Siong Chau; Chenggen Quan, Editor(s)

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