Method of establishing secret information

Details Method of establishing secret information Method of establishing secret information

1976-09-27

1978-10-17

Corbin, John K.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356109, G03H 104

Patent

active

041205596

ABSTRACT:
A method for establishing and reading secret information using holographic interference pattern techniques. A holographic plate is placed in a holder and exposed with a laser light reflected from an object and a reference laser light to create a hologram. The exposed hologram is removed and a second holographic plate is inserted into the holder. The object, which may be a matrix, is selectively deformed to provide letters or numbers in accordance with the secret information to be established. The second holographic plate is then exposed with a light reflected from the deformed object and with the reference laser light to create a second hologram. The information contained on each hologram, when viewed individually, appears to be substantially identical. However, when the two holograms are later combined and illuminated, the secret information in the form of a holographic interference pattern will be observed in the hologram.

REFERENCES:
patent: 3566137 (1971-02-01), Lemmond
patent: 3620590 (1971-11-01), Barker
patent: 3644014 (1972-02-01), Hirschberg
patent: 3761155 (1973-09-01), Lo et al.
patent: 3798620 (1974-03-01), Cosentino
patent: 3802758 (1974-04-01), Havener et al.
patent: 3924924 (1975-12-01), Fukuhara
patent: 3934461 (1976-01-01), Heflinger et al.
patent: 3961837 (1976-06-01), Bied-Charreton et al.
Magill et al., "Use of Complex Valued Spatial Filters . . . ", IBM Tech. Discl. Bull., vol. 14, No. 1, Jun. 1971, p. 131.
Abramson, "Sandwich Hologram Interferometry . . . ", Applied Optics, vol. 13, No. 9, Sep. 1974, pp. 2019-2025.
Abramson, "Sandwich Hologram Interferometry 2 . . . ", Applied Optics, vol. 14, No. 4, Apr. 1975, pp. 981-984.
Abramson, "Sandwich Hologram Interferometry 3 . . . ", Applied Optics, vol. 15, No. 1, Jan. 1976, pp. 200-205.

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