Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1975-10-20
1977-01-25
Cook, Daryl W.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340173LT, 358130, G11B 700, G02B 2118, G11C 1304
Patent
active
040052753
ABSTRACT:
A wideband analog photorecorder comprises a transparent Bragg cell as an acousto-optic transducer and a pulsed laser positioned to sequentially illuminate a moving recording medium (photographic film) through the cell. The acousto-optic cell is energized by an input electrical signal and the resultant acoustical wave passing through the cell diffracts the "strobelike" output beam from the laser so as to expose the film one line at a time with the optical analog of the signal. The pulse repetition frequency of the laser is synchronized with the velocity of acoustic wave propagation in the Bragg cell so as to expose a new signal segment in the cell with each laser pulse and thereby form one recorded line on the film. The Bragg cell utilizes an optically transparent medium, such as lithium niobate, as an acoustic wave carrier to provide optical resolution through diffraction of the laser beam. This invention may be practiced utilizing either anisotropic or normal Bragg diffraction, with or without acoustic beam steering.
The method of this invention comprises converting the amplitude modulated signal of interest to an acoustic wave, causing the acoustic wave to propagate through a Bragg cell, passing a pulsed laser output beam through an active region constituting a substantial part of the length of the Bragg cell so as to diffract the beam in accordance with the acoustic signal, and optically recording the diffracted laser beam on a moving film so that one line of data is recorded on the film each time the laser is turned on in the manner of a strobe light.
REFERENCES:
patent: 2345441 (1944-03-01), Willard
patent: 3055258 (1962-09-01), Hurvitz
patent: 3324478 (1967-06-01), Jacobs
patent: 3678472 (1972-07-01), Bass et al.
patent: 3754142 (1973-08-01), Angelbeck
Cook Daryl W.
GTE Sylvania Incorporated
Lawler John F.
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