Industrial Applications Of Diffraction Pattern Sampling
- 1 October 1979
- journal article
- Published by SPIE-Intl Soc Optical Eng in Optical Engineering
- Vol. 18 (5) , 185496
- https://doi.org/10.1117/12.7972419
Abstract
Diffraction pattern sampling was introduced by Lendaris and Stanley in the late 1960s for the analysis of transparency material. In the decade since the introduction of diffraction pattern sampling there have been numerous applications of the technique to imagery analysis. This paper describes several industrial applications in which the diffraction pattern is formed directly from the object without an intervening transparency. Each application is described by a different diffraction model and utilizes a different optical configuration. A specific algorithm for each application relates the diffraction data to the desired measurement or go/no-go decision. In general, diffraction pattern sampling systems are most effective when the inverse relationship between space and frequency domains yields high effective magnification so that fewer samples are required in the diffraction domain than would be required to directly sample the image. This generally results in a faster, lower cost system realization than conventional video analysis.Keywords
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