Method and apparatus for improving acousto-electric scanning

Details Method and apparatus for improving acousto-electric scanning Method and apparatus for improving acousto-electric scanning

1975-02-12

1976-03-16

Libman, George H.

Telegraphy

Systems

Simplex-reversing periodic

178 76, 310 98, 310 81, H04N 316, H04N 300, H01V 700

Patent

active

039447324

ABSTRACT:
An acoustically scanned, optical imaging system for converting patterns of light into electrical signals. The system includes a monolithic convolver that scans incident light patterns using two counter propagating acoustic waves. Located in front of the convolver is an opaque grid that places a spatial periodicity into the light patterns. When the frequencies of the two acoustic waves propagating in the convolver are selected so that the difference between them is a function of the spatial periodicity placed in the light patterns, the minimum threshold signal or dark current from the convolver is substantially reduced. The imaging system also includes four alternative signal generating and processing circuits that can provide a one dimensional scan, a fast Fourier transform and a Fresnel transform of the light patterns incident on the convolver. Patterns of colored light also can be convolved into electrical signals by using colored filters as the grid.

REFERENCES:
patent: 3505572 (1970-04-01), Yamashita et al.
patent: 3665225 (1972-05-01), Van den Heuvel et al.

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