Abstract
The attenuation of ultrasonic energy in metals depends on the ratio of the ultrasonic wavelength to the grain diameter. Hence, microstructure can be determined by measuring the relative rate of energy loss in a specimen at various ultrasonic frequencies. Unfortunately, such measurements are extremely time consuming. A theoretical and experimental investigation carried out at Watertown Arsenal Laboratories indicates, however, that the desired relationship between ultrasonic attenuation and frequency can be obtained in a very quick manner if the test is carried out with ultrasonic pulses of rectangular envelope. Such pulses contain ultrasonic energy distributed over a fairly wide spectrum, and the influence of a frequency dependent energy loss can he determined either by spectrum or contour analysis of the attenuated ultrasonic signal.
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