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|Title:||PZT/P(VDF-TrFE) nanocomposite hydrophones for ultrasonic measurements|
|Authors:||Chan, Helen L. W.|
Lau, Sien Ting
|Source:||1998 IEEE Ultrasonics Symposium proceedings : October 5-8, 1998, Sendai, Miyagi, Japan, p. 611-614.|
|Abstract:||Needle-type hydrophones for the calibration of medical ultrasonic transducers have been fabricated using lead zirconate titanate/vinylidene fluoride-trifluoroethylene [PZT/P(VDF-TrFE)] 0-3 nanocomposite films. The 0-3 nanocomposite film has been prepared by incorporating nanosized PZT powder (derived from a sol-gel process) in a P(VDF-TrFE) matrix. Since the piezoelectric coefficients of PZT and P(VDF-TrFE) have opposite signs, the PZT and P(VDF-TrFE) phases in the nanocomposites have been poled in opposite directions in order to give enhanced piezoelectric activity. A nanocomposite hydrophone with 0.2 volume fraction of PZT has been characterized and found to be more sensitive than a P(VDF-TrFE) hydrophone of similar structure.|
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