Broadening the potential bandwidth of piezoelectric transducers by partial depolarization

Hariti, Sid Ahmed; Holé, Stéphane; Lewiner, Jacques
June 2001
Applied Physics Letters;6/18/2001, Vol. 78 Issue 25, p4037
Academic Journal
Elastic waves are used more and more in a nondestructive way to probe the physical properties of materials. The resolution of the images or the accuracy of the measurements is directly associated with the ultrasonic signal bandwidth and amplitude a system can generate or detect. The authors propose a technique to broaden the potential bandwidth of piezoelectric generators and sensors, which is based on utilizing a nonuniformly-polarized piezoelectric material. Both simulated and experimental responses are shown. They are in good agreement and exhibit a useful bandwidth over several natural harmonics of the piezoelectric transducer. © 2001 American Institute of Physics.


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