Acoustically Scanned Image
Defense Technical Information Center, 1975 - 75 pages
The report describes work on a new type of optical scanning device which makes use of acoustic surface waves to scan an optical image. The device employs a silicon semiconductor as the photodector; the nonlinear interaction of two acoustic surface waves, whose electric fields interact with the silicon is employed in the basic mechanism of detection. Work on the airgap Si-LiNbO3 convolver configuration which is employed in this optical imaging device is described. Described is the theoretical development of the semiconductor convolver theory. Development of the technology of the ZnO on Si convolver configuration for use in the optical imaging device is discussed. A short description is given of a chirp generator, which was constructed for use in transform coding in these types of devices.
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accumulated acoustic surface wave airgap convolver bandwidth bias voltage capacitance carrier density center frequency chirp rate chirped signals configuration convolution efficiency convolution output convolution power dark current Debye length delay line density distribution depletion layer dielectric constant dielectric relaxation diodes dispersion dynamic range equivalent circuit fast surface film flat band conditions FM chirp Fourier transform Fresnel transform gap coupling grating filter hence imaging system input frequencies integral interdigital transducers inversion layer inversion regime length light linear M-value M(ph measured minority carriers n-type silicon nondegenerate convolution nonlinear coupling number of resolvable obtained operating optical imaging device oustic output voltage piezoelectric propagation loss resolvable spots scanning function scanning pulse semiconductor sensitivity shown in Fig signal-to-noise ratio silicon dioxide surface state density technique theoretical theory thickness TRANSFORM CODING UJ UJ valence band variation xx zz