By Topic

Optimization of the non-linear polarization process of piezoelectric ceramics for ultrasonic transducers

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

4 Author(s)
Duarte, M.G. ; Departamento de Engenharia Biomedica, Univ. Estadual de Campinas, Sao Paulo, Brazil ; Button, V.L.S.N. ; Costa, E.T. ; Maia, J.M.

The objective of this work was to optimize the process of non-linear polarization (apodization) of piezoelectric ceramic disks. The apodization of the piezoelectric ceramic was performed to reduce the diffraction in the acoustic field generated by ultrasonic transducers. We looked for the better temperature of the insulating mineral oil that surrounds the piezoelectric ceramic, and how long the poling electric field should be applied to the ceramic to achieve a good apodization (piezoelectric coupling coefficient kt>0.4 for the thickness mode of vibration). We have tested different initial oil bath temperatures and time interval of the poling field application. The results showed that if we raised the oil bath temperature above 200°C we needed to apply the poling field for a shorter time. Temperatures bellow 160°C were efficient only when the poling field was applied until the oil were cooled down to 35°C (what did not take less than 4 hours). We concluded that using higher temperatures, but still bellow Curie Point, it was possible to reduce the poling process, with satisfactory results, from 4-5 hours to 5 minutes.

Published in:

Ultrasonics Symposium, 2002. Proceedings. 2002 IEEE  (Volume:2 )

Date of Conference:

8-11 Oct. 2002