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Proceedings Paper

Holographic Information Storage Systems For Consumer Credit Data
Author(s): Kent K. Sutherlin; Edmund H. Christy
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Paper Abstract

A rapid and inexpensive method with which to validate the credit of a customer at the time and place of purchase has been designed and developed. The requirements call for an autonomous storage device capable of handling ten million accounts and having weekly update capability. Paramount design considerations were cost, maintenance, simplicity of operation, reliability, accuracy and readout speed. One system now being readied for field trials stores information on a piece of film 5" x 7" containing 20,000 separate holograms each .031" square. Each hologram, containing credit data on up to several hundred amounts, reconstructs information in the form of a binary spot pattern which is projected onto a photodetector matrix. A small pulsed gas laser of unique design is used in each device for instantaneous readout. Very stringent requirements are placed on beam balance ratio and film exposure in order to insure high fidelity pattern reconstruction, good signal to noise, and reasonable diffraction efficiency. Intensity threshold detection is complicated by both a widely varying number of spots in the reconstruction patterns and non-uniformity in the detector elements.

Paper Details

Date Published: 9 December 1969
PDF: 12 pages
Proc. SPIE 0018, Pattern Recognition Studies I, (9 December 1969); doi: 10.1117/12.946826
Show Author Affiliations
Kent K. Sutherlin, Baus Optics, Inc. (United States)
Edmund H. Christy, Baus Optics, Inc. (United States)


Published in SPIE Proceedings Vol. 0018:
Pattern Recognition Studies I

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