Optical heterodyne system for imaging in a dynamic diffusive med

Details Optical heterodyne system for imaging in a dynamic diffusive med Optical heterodyne system for imaging in a dynamic diffusive med

1978-08-02

1980-03-11

Griffin, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

356349, 455609, H04N 718

Patent

active

041930886

ABSTRACT:
A system for providing an image of an object from a coherent light signal transmitted from the object through a dynamic diffusive medium is provided with a planar surface receiving the signal wavefront, the received wavefront comprising an array of discrete picture elements. A local oscillator signal is mixed with each picture element in a selected order to provide light responsive signals which represent the distribution of power over frequency of each picture element, all of the frequency components of the light responsive signals being included in a first frequency range of selected bandwidth which is centered around an intermediate frequency. A narrow-band electronic filter receives each of the light responsive signals and removes all frequency components therefrom which are not included in a second, narrow, bandwidth centered around the intermediate frequency. An image of the object is provided by electronic apparatus which receives the filtered signals.

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Mandel and Wolf-Optimum Conditions for Heterodyne Detection of Light, Jour. Opt. Soc. of America, vol. 65, #4, Apr. 1975, pp. 413-418.

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