FIELD: ultrasonic detection. SUBSTANCE: device has a coaxial horn and prehorn chamber and an acoustical-electrical transducer acoustically insulated from it is the form of a core-type piezoelectric unit and matching plate attached to its end through an annular support; the height of the prehorn chamber is multiple of half the wave length in gas. The diameter of the external hole of the horn and thickness of the matching plate are determined for the second and third modes of its flexural vibrations. EFFECT: improved design. 6 dwg
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