On Ultrasonic Scattering by Polycrystals

Abstract

The scatter in phase which occurs when a beam of ultrasonic radiation transverses polycrystalline medium is here treated as a stochastic process. This approach leads to an attenuation from polycrystalline scattering proportional to the grain size divided by the square of the wave-length. Whereas prior treatments of this subject are valid for the wave-lengths either much smaller or much larger than the grain size, the method used here holds best over the intermediate frequency range.