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Scattered ultrasound fields measured by scanning laser vibrometry
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0003-4879-8261
HTW, Hochschule für Technik und Wirtschaft, Dresden.
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2003 (English)In: Optical Measurement Systems for Industrial Inspection III: 23 - 26 June 2003, Munich, Germany / [ed] Wolfgang Osten, Bellingham, Wash.: SPIE - International Society for Optical Engineering, 2003, p. 717-727Conference paper, Published paper (Refereed)
Abstract [en]

A scanning laser Doppler vibrometer is used to make quantitative measurements of 2D ultrasound fields in air. The laser light traverses the measurement volume to and from a rigid reflector and determines the velocity of the change in optical path length, which with constant geometry only depends on the changes in index of refraction. Assuming adiabatic conditions, the refractive index rate is proportional to the sound pressure rate and quantitative measures of the sound field are possible to achieve. The emitted or scattered ultrasound being measured origins from a source or object outside the recording area. Using phase conjugation the sound field is then digitally reconstructed outside the recording area, and the reconstructed phase and intensity reveals the location of the source or object. The combination of several such reconstructions of ultrasound fields of different wavelengths, so called wavelength scanning, provides an intensity map that very accurately gives the position of the source. This opens many new possibilities to study hidden or unknown sound sources or scattering objects

Place, publisher, year, edition, pages
Bellingham, Wash.: SPIE - International Society for Optical Engineering, 2003. p. 717-727
Series
Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X ; 5144
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-31585DOI: 10.1117/12.500398ISI: 000184287300081Scopus ID: 2-s2.0-0141608622Local ID: 5ce2b986-6480-4970-9648-d728a8855228ISBN: 819450146 (print)OAI: oai:DiVA.org:ltu-31585DiVA, id: diva2:1004819
Conference
Optical Measurement Systems for Industrial Inspection : 23/06/2003 - 26/06/2003
Note
Validerad; 2003; 20120123 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-07-10Bibliographically approved

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Olsson, ErikMolin, Nils-ErikSjödahl, Mikael

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