Continuous feed holographic correlator for randomly oriented wor

Details Continuous feed holographic correlator for randomly oriented wor Continuous feed holographic correlator for randomly oriented wor

1977-08-24

1979-11-13

Stern, Ronald J.

Optics: measuring and testing

Document pattern analysis or verification

350 377, 350162SF, G06K 908, G03H 128, G02B 2738

Patent

active

041741790

ABSTRACT:
A method and apparatus to optically control mass produced articles by a holographic correlator. The articles are continuously moved through an input beam of the holographic correlator. The correlator employs a holographic filter having a plurality of Fourier spectra recorded thereon, which are spatially separated but overlapping and which correspond to different orientations of the reference specimen. During the translation of the object through the input beam, the beam is reflected so that all spectra are addressed through the holographic filter. The output correlation spot is detected through a diaphragm having a slit-form aperture. This apparatus and the method it employs does not depend on the orientation between the article and the holographic filter, thereby providing accurate results at high speeds.

REFERENCES:
patent: 3670305 (1972-06-01), Maloney
patent: 3751132 (1973-08-01), Groh
patent: 3773401 (1973-11-01), Douklias et al.
patent: 3794406 (1974-02-01), Kock et al.
patent: 3802762 (1974-04-01), Kiemle

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