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Tomographic reconstruction of 3D ultrasound fields measured using laser vibrometry
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
2007 (English)In: Experimental analysis of nano and engineering materials and structures: proceedings of the 13th International Conference on Experimental Mechanics, Alexandroupolis, Greece, July 1-6, 2007 / [ed] Emmanuel Gdoutos, Dordrecht: Encyclopedia of Global Archaeology/Springer Verlag, 2007Conference paper, Published paper (Refereed)
Abstract [en]

A method for obtaining the amplitude and phase distribution of an ultrasound field in air, using laser vibrometry and computed tomography, is described. Radiating ultrasound transducers causes pressure variations in the air, which lead to refractive index changes, which in turn can be recorded by the use of interferometric instruments like the laser vibrometer. This point measuring method for the measurement and visualization of sound fields was proposed by Zipser et al. [1, 2]. In order to measure the whole sound field, the laser beam is scanned over the area of interest. With this technique, the absolute phase of the field is obtained directly from the measurements while the amplitude needs some calculations using the Gladstone Dale equation [3]. Moreover, the obtained result using laser vibrometry for sound measurements is an integral of the sound field along the laser light path. The projection effects due to this integral were studied by Olsson and Tatar [4]. In this paper however, the projection property of the measurement method is taken into advantage. Tomographic 3D reconstruction of the sound field is obtained using several projections taken at different angles. The phase and the amplitude distributions of an ultrasound field due to several transducers, emitting at a frequency of 40 kHz, positioned both symmetrically and non-symmetrically are reconstructed.

Place, publisher, year, edition, pages
Dordrecht: Encyclopedia of Global Archaeology/Springer Verlag, 2007.
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-31603DOI: 10.1007/978-1-4020-6239-1_167Local ID: 5d79e750-7e17-11dc-b50c-000ea68e967bISBN: 1-402-06238-9 (print)OAI: oai:DiVA.org:ltu-31603DiVA, id: diva2:1004837
Conference
International Conference on Experimental Mechanics : 01/07/2007 - 06/07/2007
Note
Godkänd; 2007; 20071019 (erka)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-04-25Bibliographically approved

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Tatar, KouroshOlsson, ErikForsberg, Fredrik

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