Holographic verification system with indexed memory

Details Holographic verification system with indexed memory Holographic verification system with indexed memory

1974-02-08

1979-07-31

Fears, Terrell W.

Static information storage and retrieval

Information masking

Diffraction

350 35, 365120, 365127, 365193, 365216, 365233, G11C 1304

Patent

active

041632907

ABSTRACT:
A verification system utilizing a holographic memory defined by a multiplicity of individual holograms on a photographic strip arranged side by side in elongate, parallel, hologram channels of substantially equal length. A holographic index on the strip identifies the information stored in each channel. The memory is a holographic record of binary spot patterns of multi-digit numbers which are sequentially recorded. The spot pattern for any given number may extend over one or more holograms to fully utilize the available recording space. Data compression is employed to reduce or eliminate the recordation of digits which are identical to corresponding digits of a preceding number to thereby reduce the memory bulk. A given number to be verified is entered in a keyboard and stored, the index is searched and the appropriate memory channel is then searched for a match of the given number with a number in the memory by producing and detecting images from the recorded holograms. The presence or absence of such a match is signalled to the operator to thereby complete the verification process.

REFERENCES:
patent: 3832698 (1974-08-01), Ishii
patent: 3841729 (1974-10-01), Ando
patent: 3849766 (1974-11-01), Crowther et al.
patent: 3891976 (1975-06-01), Carlsen

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