Quantitative grain size determination apparatus - uses irradiation of material under test with ultra sound with single frequency for sample

摘要

Quantitative determination of grain size in materials uses irradiation of ultra-sound with single frequency for samples. The scattered sound pressure amplitude is measured in dependence on the transit time of the sound wave in the samples. The measurement is arranged over limited structional areas by movement of the sound generator relative to the sample either continuously or in discrete steps. The scatter coefficient is determined from a specified relation by means of a tangent to the function. The first index (m) in the relation denotes multiple scatter while the second index (E) denotes single scatter.