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Proceedings Paper

Quality Control Of Small Mechanical Pieces Using Optical Correlation Techniques
Author(s): G. Indebetouw; T. Tschudi; G. Herziger
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Paper Abstract

An objective and automatic method for quality control in a production line has been investigated. The proposed technique is an optical correlation in which the dimensional information of a master piece is stored in a hologram. A real time signal, which is a measure of the similarity between the master and the tested piece is obtained by integrating the correlation distribution over a small area on a photo detector. The necessity of an accurate positionment and orientation of each piece, which would be essential for high precision control can be eliminated by scanning the detector area. Synthetic holograms were found particularly helpful to adapt the response curve to practical requirements (sensitivity, dynamic range, ...) and to enhance some critical features of the work piece. Simple examples show the possibility of detecting shape errors of a few microns (less than 1% of the dimensions of the piece under test).

Paper Details

Date Published: 9 July 1976
PDF: 9 pages
Proc. SPIE 0074, Image Processing, (9 July 1976); doi: 10.1117/12.954702
Show Author Affiliations
G. Indebetouw, Institute of Applied Physics (Switzerland)
T. Tschudi, Institute of Applied Physics (Switzerland)
G. Herziger, Institute of Applied Physics (Switzerland)

Published in SPIE Proceedings Vol. 0074:
Image Processing
John C. Urbach, Editor(s)

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