ACOUSTICAL METHOD OF DETERMINATION OF ELASTIC CONSTANTS OF CURRENT-CONDUCTING SOLIDS Russian patent published in 2018 - IPC G01N29/07 

FIELD: electricity.

SUBSTANCE: usage to determine the elastic constants of conductive solids. Summary of the invention is that an electromagnetic one- or multi-period pulse and a constant or pulsed magnetic field simultaneously or alternately act on the surface of the local area of the said solid body, acoustic longitudinal and two plane-polarized shear waves are excited, displacement vectors of the said shear waves are oriented, respectively, along and across the rolling direction or the applied force, one-multiple-reflected acoustic signals are received and amplified, while the said rolling directions or the applied force are specified in terms of the maximum values of the amplitudes of the shear waves, one-multiple-reflected echo signals of the longitudinal and shear waves of the corresponding polarization are extracted from the received pulse sequence by gating, correlation processing of the signals is performed, time intervals between echo signals, respectively, of the longitudinal and shear waves of the corresponding polarization are measured, propagation velocities of acoustic waves are calculated and the elastic constants are determined from the corresponding formulas by the ratio of these intervals and velocities and the known value of the density of the solids under study.

EFFECT: ensuring the ability to reliably and accurately determine the values of the elastic constants of products with a roughly machined surface using electromagnetic-acoustic transducers that do not require the use of contacting media.

3 cl, 2 dwg, 3 tbl