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Coupling of wideband impulses generated by granular chains into liquids for biomedical applications

Harput, S; Freear, S; Gelat, P; Saffari, N; Yang, J; Akanji, O; Thomas, PJ; (2016) Coupling of wideband impulses generated by granular chains into liquids for biomedical applications. In: Proceedings of the 2016 IEEE International Ultrasonics Symposium (IUS). IEEE Green open access

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Abstract

An ultrasonic transducer technology to generate wideband impulses using a one-dimensional chain of spheres was previously presented. The Hertzian contact between the spheres causes the nonlinearity of the system to increase, which transforms high amplitude narrowband sinusoidal input into a train of wideband impulses. Generation of short duration ultrasonic pulses is desirable both in diagnostic and therapeutic ultrasound. Nevertheless, the biggest challenge in terms of adaptation to biomedical ultrasound is the coupling of the ultrasonic energy into biological tissue. An analytical model was created to address the coupling issue. Effect of the matching layer was modelled as a flexible thin plate clamped from the edges. Model was verified against hydrophone measurements. Different coupling materials, such as glass, aluminium, acrylic, silicon rubber, and vitreous carbon, was analysed with this model. Results showed that soft matching layers such as acrylic and rubber inhibit the generation of higher order harmonics. Between the hard matching materials, vitreous carbon achieved the best results due to its acoustic impedance.

Type: Proceedings paper
Title: Coupling of wideband impulses generated by granular chains into liquids for biomedical applications
Event: 2016 IEEE International Ultrasonics Symposium (IUS)
Location: Tours, FRANCE
Dates: 18 September 2016 - 21 September 2016
ISBN-13: 978-1-4673-9898-5
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/ULTSYM.2016.7728481
Publisher version: http://dx.doi.org/10.1109/ULTSYM.2016.7728481
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Technology, Engineering, Electrical & Electronic, Engineering, EXCITATION
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci > Department of Surgical Biotechnology
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1533578
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