Optical: systems and elements – Holographic system or element – Fourier transform holography
Patent
1990-12-11
1992-09-01
Arnold, Bruce Y.
Optical: systems and elements
Holographic system or element
Fourier transform holography
359 30, 359559, 359564, 382 31, 382 45, 382 46, 382 54, G03H 116, G02B 2746, G06K 976
Patent
active
051444607
ABSTRACT:
A method and apparatus for registering an image using coherent radiation. Spatial homodyne means are employed to generate component signals which comprise a homodyne equivalent of the image, and the component signals of the homodyne equivalent are registered at a registering medium. Using a new principle of construction, the invention achieves on standard registering media a substantial improvement in conrast resolution. Indeed, the number of contrast levels that can be registerd by the invention is the square of the number that can be registered by the prior art. The application of temporal submodulation in a device embodying the invention additionally provides tensor parasitic phase-shift invariance. The invention may be embodied in a class of spatial-temporal-spatial image recording devices, such as videotape recorders and television transmission systems, in which a sequence of images is registered in the form of a temporal signal, and then reconverted from the temporal signal into sequence of reproduced images.
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Arnold Bruce Y.
Lerner Martin
The DZ Company
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