Abstract
The necessary experimental requirements of acoustic interferometry in gases have been examined by optical and electrical methods with the object of evaluating the influence of the boundary of the acoustic field, and the effect of departure from parallelism of the reflector with the source upon the experimentally determined attenuation and reflection coefficients. The results show that the requirements of parallelism of the reflector are as rigorous as in optical interferometry and are best met by adjustment for maximum height of peaks rather than by optical or mechanical methods. Recently determined values of reflection coefficients at 1237 kc are found to be in much better agreement among themselves and with the theoretical predictions of the theory (in press) of K. F. Herzfeld for dissipative reflection coefficients than most of those heretofore obtained with the resonator interferometer. Schlieren photographs of modes of vibration of X-cut piezoelectric quartz plates and of the acoustic radiation from them will be shown.
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