Abstract
The theoretical resolution capability of Bragg-imaging technique for two-dimensional problems has been verified using ultrasonic waves in solids at frequencies in the vhf and L-band range. The resolution was investigated as a function of ultrasonic wavelength and laser-beam convergence angle. With an optical arrangement which utilizes a combination of a diffraction-limited spherical lens and low-grade cylindrical lenses, resolution nearly equal to the theoretical value was obtained. For this investigation it was necessary to devise techniques for generating multiple ultrasonic beams in one- and two-dimensional array configurations with well-defined beam dimensions and separations. It is found that the most reliable method of fabricating such configurations is to deposit a gold-film back electrode with an identical array pattern on a uniform CdS film transducer. The application of Bragg-imaging technique for visualizing the activity pattern of a CdS thin-film transducer is also illustrated.
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