Passive materials for high frequency piezocomposite ultrasonic transducers

1311 17 34696 6 76567 document 34696 Webster10PhD.pdf application/pdf 1b03a024e0cca4c4502b572db3b8b67b MD5 3819563 2014-03-03 12:51:14 http://etheses.bham.ac.uk//id/eprint/1311/1/Webster10PhD.pdf 1311 1 1 application/pdf application/pdf en public

Webster10PhD.pdf

http://eprints.org/relation/hasVolatileVersion http://etheses.bham.ac.uk/id/document/34700 http://eprints.org/relation/hasVersion http://etheses.bham.ac.uk/id/document/34700 http://eprints.org/relation/hassmallThumbnailVersion http://etheses.bham.ac.uk/id/document/34700 http://eprints.org/relation/hasVolatileVersion http://etheses.bham.ac.uk/id/document/34701 http://eprints.org/relation/hasVersion http://etheses.bham.ac.uk/id/document/34701 http://eprints.org/relation/haspreviewThumbnailVersion http://etheses.bham.ac.uk/id/document/34701 http://eprints.org/relation/hasVolatileVersion http://etheses.bham.ac.uk/id/document/34702 http://eprints.org/relation/hasVersion http://etheses.bham.ac.uk/id/document/34702 http://eprints.org/relation/hasIndexCodesVersion http://etheses.bham.ac.uk/id/document/34702 34700 2 76590 document 34700 small.png image/png 2157e58509d04866c11d9244f8fe6b96 MD5 2645 2014-03-03 13:19:32 http://etheses.bham.ac.uk//id/eprint/1311/2/small.png 1311 2 2 image/png thumbnail_small Thumbnail Documents conversion from application/pdf to thumbnail_small en staffonly

small.png

preview.jpg

indexcodes.txt

http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/34696 http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/34696 http://eprints.org/relation/isIndexCodesVersionOf http://etheses.bham.ac.uk/id/document/34696 archive 4031 disk0/00/00/13/11 2014-03-03 13:17:19 2019-01-23 09:53:54 2014-03-03 13:17:19 thesis show 0 Webster Rhiannon Alys Button Tim W University of Birmingham Passive materials for high frequency piezocomposite ultrasonic transducers unpub TN 10col_ephy High frequency ultrasound is receiving increased attention for medical imaging in areas such as ophthalmology and dermatology. Recent advances in the manufacture of fine scale piezocomposite materials mean there is great potential for commercial transducers far superior to conventional devices currently in clinical use. This Thesis reports the fabrication and characterisation of passive materials suitable for use in high frequency piezocomposite transducer devices. Epoxy composites have been fabricated using tungsten and alumina as filler material with volume fractions up to 0.4. Acoustic impedance and attenuation has been determined for different filler volume fractions to provide data for modelling to aid transducer design and also determine the filler volume fraction required to provide optimal results. Acoustic impedance values of 3-15MRayl were measured for the materials made in this work and the influence of filler particle size and shape is also discussed. Piezocomposite transducers have been constructed using material developed in this work and compared to devices made with more conventional passive materials. In addition to the fabrication of the composite samples for characterisation a process for incorporating material into transducers is described showing how the fabrication can be a part of the transducer construction resulting in an efficient and neat package. 2010-07 2009-09 graduation eng author checked This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder. Applied Functional Materials Limited Applied Functional Materials Limited public 236 University of Birmingham School of Metallurgy and Materials d_ph other epsrc 2010-07 graduation