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Crypto Holography

IP.com Disclosure Number: IPCOM000093861D
Original Publication Date: 1966-Mar-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Lohmann, AW: AUTHOR

Abstract

An image can be recorded on a photographic medium in the form of a hologram. When the photographic film is viewed directly, the image does not appear. However, the image can be reconstructed by suitable apparatus.

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Crypto Holography

An image can be recorded on a photographic medium in the form of a hologram. When the photographic film is viewed directly, the image does not appear. However, the image can be reconstructed by suitable apparatus.

The apparatus shown in the top drawing is conventional apparatus for recording the hologram of an object with the exception that a ground glass is inserted between the object and the hologram, as shown. The ground glass randomizes the phase of the light being transmitted from the object to the hologram. The only way that an image of the object can be reconstructed is by utilizing apparatus that includes a piece of ground glass that is identical to the first piece of ground glass, but having the light transmitted through it in the opposite direction.

The apparatus for reproducing an image of the hologram produced by the apparatus shown in the top drawing is shown in the bottom drawing. The apparatus shown in the bottom drawing is conventional apparatus for producing an image from a hologram with the exception that a piece of ground glass is inserted between the hologram and the image.

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