Abstract
Measurements of ultrasonic absorption in critical binary mixtures have given rise to a controversy over the mechanism of attenuation. Measurements by Brown and Richardson indicate the presence of a scattering phenomenon, while those of D'Arrigo, Sette, Mistura, and Hunter can be interpreted as a thermal relaxation process. The latter failed to detect any significant scattered signal. To establish a criterion for signal strengths to be expected from scattering and to develop a workable method for detecting such signals, a fundamental scattering study at 2 MHz has been inaugurated. Patterns obtained with simple scattering structures will be presented—single slit, multiple slit, grating, etc.—and the variation of pattern with parameters—wavelength, slit dimensions, hydrophone dimensions, etc.—will be discussed. [Work sponsored by the Office of Naval Research.]
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