SEPARATE-COMBINED ULTRASONIC TRANSDUCER Russian patent published in 1998 - IPC

FIELD: determination of translational and rotary motion speed. SUBSTANCE: to obtain effective high-frequency wide-band transducer for gas medium, radiator and receiver are made as piezoelectric elements with front cover-plates consisting of two quarter-wave layers with specific impedances Z₁= (0,1-0,4)10⁶Pa•s/m and Z₂= (1-5)10⁶Pa•s/m. Layer with specific resistance Z₁ is external one. Cylindrical body of transducer is made of rubber-like material. It has diametrical recess which serves as acoustic screen. Radiator and receiver are positioned in recesses of body symmetrical relative to acoustic screen by means of rubber sealing rings fixed on side surfaces. EFFECT: higher measurement results. 3 cl, 1 dwg