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9 July 1976 Quality Control Of Small Mechanical Pieces Using Optical Correlation Techniques
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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).
© (1976) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
G. Indebetouw, T. Tschudi, and G. Herziger "Quality Control Of Small Mechanical Pieces Using Optical Correlation Techniques", Proc. SPIE 0074, Image Processing, (9 July 1976);


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