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Studying Cavitation Enhanced Therapy

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Curved PVDF airborne transducer.

H Wang¹, M Toda

¹Measurement Specialties Inc., Norristown, PA.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|February 5, 2008

Summary

This study examines curved polyvinylidene fluoride (PVDF) transducers for airborne ultrasound. The length extensional mode generates stronger ultrasound waves than the flexural bending mode, offering potential for optimized transducer design.

Area of Science:

Materials Science
Acoustics
Piezoelectric Devices

Background:

Partially cylindrical (curved) polyvinylidene fluoride (PVDF) transducers are effective for airborne ultrasonic ranging.
Their unique geometry allows for asymmetrical ultrasound beam angles (broad horizontally, narrow vertically).

Purpose of the Study:

To theoretically and experimentally investigate a curved PVDF air transducer.
To analyze the characteristics of its length extensional and flexural bending modes.
To provide a theoretical model for optimizing transducer performance.

Main Methods:

Experimental measurement of surface vibration profiles using a laser vibrometer.
Theoretical calculations based on a developed model.
Transient surface displacement measurements.

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Main Results:

Two resonance modes were identified: length extensional and flexural bending.
Surface vibration was non-uniform along the curvature for both modes.
The length extensional mode produced stronger ultrasound due to in-phase vibrations.

Conclusions:

Theoretical model accurately predicted experimental surface vibration profiles.
Length extensional mode is superior for generating ultrasound compared to the flexural bending mode.
Resonance frequencies and amplitudes are sensitive to structural and material properties, enabling design optimization.