Optimization Of The Non-linear Polarization Process Of Piezoelectric Ceramics For Ultrasonic Transducers

dc.creatorDuarte M.G.
dc.creatorNantes Button V.L.S.
dc.creatorCosta E.T.
dc.creatorMaia J.M.
dc.date2002
dc.date2015-06-30T16:42:45Z
dc.date2015-11-26T14:59:26Z
dc.date2015-06-30T16:42:45Z
dc.date2015-11-26T14:59:26Z
dc.date.accessioned2018-03-28T22:10:59Z
dc.date.available2018-03-28T22:10:59Z
dc.identifier
dc.identifierProceedings Of The Ieee Ultrasonics Symposium. , v. 2, n. , p. 1111 - 1114, 2002.
dc.identifier10510117
dc.identifier
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-0036992973&partnerID=40&md5=29eaffe97262c6d5bd9389672aa71c9b
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/101693
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/101693
dc.identifier2-s2.0-0036992973
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1256046
dc.descriptionThe 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 k t>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 below 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 below Curie Point, it was possible to reduce the poling process, with satisfactory results, from 4-5 hours to 5 minutes.
dc.description2
dc.description
dc.description1111
dc.description1114
dc.descriptionButton, V.L.S.N., Costa, E.T., Maia, J.M., Non-uniform piezoelectric ceramic polarisation: Minimising ultrasound field diffraction (2000) Proceedings of the 25th Acoustical Imaging, 25, pp. 131-136. , edited by Michael Halliwell and Peter N. T. Wells (ISBN 0-306-46516-7)
dc.descriptionButton, V.L.S.N., Costa, E.T., Maia, J.M., Dantas, R.G., Diffractive limited acoustic field of an apodized ultrasound transducer (2000) SPIE's International Symposium on Medical Imaging 2000, 3982, pp. 132-141. , ISBN: 0-8194-3599-6
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dc.languageen
dc.publisher
dc.relationProceedings of the IEEE Ultrasonics Symposium
dc.rightsfechado
dc.sourceScopus
dc.titleOptimization Of The Non-linear Polarization Process Of Piezoelectric Ceramics For Ultrasonic Transducers
dc.typeActas de congresos


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