FIELD: mechanical engineering. SUBSTANCE: device comprises piezoelectric transducers made up as at least one emitter-receiver pair. The emitter and receiver can be positioned from both sides of the cutting zone. The sizes and shape of the emitter and receiver are the same. The number of the transducers of one type in the pair is no less than two. A distance between the transducers of one type from one side of the cutting zone depends on the wavelength of ultrasonic oscillation. EFFECT: enhanced reliability. 2 cl, 2 dwg
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