Local elastic measurements in solids using the acoustic transformer technique

The effect of transformation of focused ultrasound radiation into collimated beams of longitudinal and transverse waves in the volume of a hemispherical transformer after refraction on its surface has been described. When the hemisphere is fastened on a studied plane–parallel object, the formed sharp beams of elastic waves incident normally on the surface of the sample make it possible to perform elastic measurements with minimum errors, which can be due to refractive aberrations of the focused beam.