FIELD: flaw detection, structure investigations, depth measuring of concrete and rock articles. SUBSTANCE: device has sealed housing with protector and is filled with dampening liquid which contains two piezoelectric elements. Protector is mounted for contact to surface of tested article in point or line and has small wave size. Piezoelectric elements are located in symmetry about acoustic axis of converter in phase or in opposite phases. EFFECT: increased functional capabilities. 2 cl, 1 dwg
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