ULTRASONIC THIN-WALLED TUBE WAVE DEVICES FOR SENSOR APPLICATIONS

Integrated gravimetric sensor configurations have been demonstrated by employing a sol-gel processed thin piezoelectric lead zirconate titanate (PZT) film coated coaxially on stainless-steel tubes and interdigital transducers (IDT) fabricated as the transmitter and receiver on the curved tube surfaces. We have observed tube waves along both the axial and circumferential directions between 1 and 8 MHz. Theoretical analysis indicates that high mass sensitivity can be achieved by keeping the tube wall thin.© 1995 American Institute of Physics.