Air-Coupled Ultrasonic Transducers Based on an Application of the PMN-32%PT Single Crystals

Abstract

Application of air-coupled ultrasonic measurements is problematic due big acoustic transduction losses of conventional ultrasonic air-coupled transducers. One of the ways to solve this problem is application of more efficient ultrasonic transducers made of PMN-32 %PT crystals. The objective of this work was development of novel effective air-coupled ultrasonic transducer with PMN-32% PT crystal plates. The high electromechanical factor of the transverse extension mode enables to achieve a good performance of air-coupled transducers. The developed and investigated ultrasonic transducer possesses in a transmission mode 10 times better efficiency than a PZT composite ultrasonic transducer.

Keywords:

• PMN-32%PT single crystals
• air-coupled ultrasonic transducers
• mechanical displacement
• ANSYS modeling

Funding

The research leading to these results has received funding from Lithuanian-Swiss cooperation programme to reduce economic and social disparities within the enlarged European Union under project agreement No. CH-3-ŠMM-01/02.