Device for quality control of holograms

Details Device for quality control of holograms Device for quality control of holograms

1987-04-28

1989-02-07

McGraw, Vincent P.

Optics: measuring and testing

Document pattern analysis or verification

356237, 350 36, G03H 102

Patent

active

048027588

ABSTRACT:
The device consists essentially of a frame designed to support the hologram, at least one source of electromagnetic radiation, at least one sensor and a processing unit which, in at least one predetermined relative position assumed by the aforesaid frame, source and sensor, verifies that the electrical signals emitted by the sensor and dependent upon the radiation associated with a portion of the reconstructed image of the hologram correspond to electrical signals previously stored in the memory of the processing unit.

REFERENCES:
patent: 3619025 (1971-11-01), Hannan
patent: 3643216 (1972-02-01), Greenaway et al.
patent: 4030830 (1977-06-01), Holly
patent: 4264192 (1981-04-01), Robb
patent: 4288164 (1981-09-01), Toth

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