Split-mode ultrasonic transducer.
A split-mode ultrasonic transducer is investigated in both theory and experiment. This transducer is a two-dimensional structure of periodically poled domains in a ferroelectric wafer with free surfaces. The acoustic vibrations are excited by a radio frequency electric current applied along the length of the wafer, which allows the basal-plane surfaces to be free of metal coatings and thus ready for further biomedical applications. A specific physical property of this transducer consists of the multiple acousto-electric resonances, which occur due to an acoustic mode split when the acoustic half-wavelength is equal to the domain length. Possible applications include ultrasonic generation and detection at the micro-scale, intravascular sonification and visualization, ultrasound therapy of localized small areas such as the eye, biomedical applications for cell cultures, and traditional nondestructive testing including bones and tissues. A potential use of a non-metallized wafer is a therapeutic application with double action that is both ultrasound itself and an electric field over the wafer. The experimental measurements and theoretical calculations are in good agreement.
Department of Physics and Astronomy, The University of Mississippi, University, Mississippi 38677, USA.
Igor
I
Ostrovskii
Lucien
L
Cremaldi
D003198:Computer Simulation; D004867:Equipment Design; D008422:Materials Testing; D008962:Models, Theoretical; D009038:Motion; D009716:Numerical Analysis, Computer-Assisted; D009991:Oscillometry; D011312:Pressure; D013016:Sound; D013997:Time Factors; D014159:Transducers; D014464:Ultrasonic Therapy / Q000295:instrumentation*; D014732:Vibration