Communications: electrical – Selective – Intelligence comparison for controlling
Patent
1975-04-28
1976-12-07
Farley, Richard A.
Communications: electrical
Selective
Intelligence comparison for controlling
73 675H, 313369, G01S 966, H01J 31495
Patent
active
039965520
ABSTRACT:
A device for providing a hologram of an object which may be converted to an optical image in real time. The device is part of an acoustical holographic system which uses a source of coherent acoustic radiation to irradiate the object which reflects the acoustic radiation on to a piezoelectric transducer to provide a rapidly varying sinusoidal electronic charge pattern corresponding to the reflected acoustic radiation. Electrons are released from a photocathode, illuminated by a radiation source, in a spatial distribution of electron energies corresponding in space and time to the electronic charge pattern. A first grid positioned adjacent the photocathode is maintained at a potential to provide a modulated electron current which varies in space and time linearly in accordance with the acoustic input. The electron current is modulated by a second grid energized by a coherent reference voltage of fixed phase to function as a reference signal as used in holography. A microchannel plate electron multiplier amplifies the modulated electron current, and the amplified current is imaged on a high potential phosphor screen and provides an optical image of the hologram of the insonified object. The hologram may be converted into electric signals (video) by a conventional TV camera. For displaying an image of the object itself in real time, the video signals may be processed in an electro-optical Fourier transform converter tube, or may be processed by a fast Fourier transform computer and displayed on a cathode ray tube.
REFERENCES:
patent: 3879700 (1975-04-01), Barkhoudarian et al.
Farley Richard A.
Smith Robert C.
The Bendix Corporation
Thornton William F.
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