FIELD: physics.
SUBSTANCE: radiation is made with elastic wave pulse converters normally to surface of flat product consistently at two frequencies f and fj; the first ground pulses are received at these frequencies and their amplitudes are measures. In addition amplitude of the second ground pulse is measured at frequency f, while the n ground pulse is measured at frequency. Amplitude ratio of the first and the second ground pulses is detected at frequency f and the first, and of the first and n ground pulses - at frequency fj, where fj=f/m, a m=n-1 where n is the odd integer, and the average size of grain D of material is calculated by corresponding formula.
EFFECT: provided control of grain average size of material without application of reference samples.
2 dwg
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