ULTRASONIC PIEZOELECTRIC TRANSDUCER Russian patent published in 2002 - IPC

FIELD: measurement technology; ultrasonic flaw inspection devices. SUBSTANCE: transducer designed for measuring material flow rates and speed using ultrasonic method and for ultrasonic flaw inspection has faceted acoustic line in the form of rectangular parallelepiped incorporating depression in its body on one of side faces wherein at least three faces are formed at certain angle to one another one of them carrying piezoid and functioning as measuring face; acute angle formed between the latter and locating face of acoustic line is greater than or equal to 45 deg; locating face and three reflecting faces of acoustic line form ultrasonic wave passage in acoustic line. First and second reflecting faces are parallelepiped faces. Third reflecting face of acoustic line is second face of depression. Length, height, and width of acoustic line, as well as length of measuring face depend on dimensions of piezoid, angle between measuring and locating faces, distance along normal between measuring face end closest to locating face and center of piezoid, distance along normal between locating face and start of depression, and also on ultrasonic wave diverging angles in acoustic line. Depression is made in the form of rectangular prism one of whose side faces lies in acoustic line face plane. Two other faces of depression are measuring face and third reflecting face. Main prism is located in plane of acoustic-line side faces. One of side faces of prism is in full alignment with side face of acoustic line, Depression is provided with third face parallel to locating face that forms obtuse angle with measuring face. Apart from above-given characteristics acoustic line length depends on distance between start of depression and measuring face. Contour of locating face follows that of object under inspection at installation point of ultrasonic piezoelectric transducer. EFFECT: enhanced measurement accuracy due to reduced reverberation noise level and signal distortions. 6 cl, 7 dwg