Title :
PZT/P(VF/TrFE) nanocomposite hydrophones for ultrasonic measurements
Author :
Chan, H.L.W. ; Lau, S.T. ; Kwok, K.W. ; Choy, C.L.
Author_Institution :
Dept. of Appl. Phys., Hong Kong Polytech., Kowloon, Hong Kong
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
Keywords :
biomedical transducers; biomedical ultrasonics; calibration; hydrophones; ultrasonic transducers; PZT/P(VF/TrFE) nanocomposite hydrophones; enhanced piezoelectric activity; lead zirconate titanate/vinylidene fluoride-trifluoroethylene; medical instrumentation; medical ultrasonic transducers calibration; needle-type hydrophones; sol-gel process; ultrasonic measurements; Acoustic waves; Artificial intelligence; Biomembranes; Ceramics; Electrodes; Needles; Sonar equipment; Temperature; Ultrasonic variables measurement; Wire;
Conference_Titel :
Ultrasonics Symposium, 1998. Proceedings., 1998 IEEE
Conference_Location :
Sendai
Print_ISBN :
0-7803-4095-7
DOI :
10.1109/ULTSYM.1998.762223
