Single layer near-field acoustic imaging in space-invariant reflective environments
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
The visualization of optical fields, or widely known as photography, is a common practice that can also be applied to acoustic fields. No less than three decades of research in acoustic imaging demonstrate its potential and relevance in plenty applications such as sound source identification and localization, as well as characterization of noise generation mechanisms. In particular, the resolution of the acoustic images can be greatly enhanced by means of measuring the sound in the acoustic near-field. Nevertheless, it is often the case that the field is disturbed by the measurement environment, in the form of noise and reflections, and the source must then be transported to a much quieter place, for instance, an echo-free chamber. Current state-of-the-art methods tackle the aforesaid complications, at the cost, however, of measuring two images instead of one: resulting in twice as many measurement sensors. The contribution of this thesis is the introduction of a novel technique that only requires a single image to be captured, and is specially tailored for acoustic imaging in space-invariant reflective environments, that is, in the presence of reflecting surfaces that are parallel to the measurements.
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. , vii, 38 p.
TRITA-AVE, ISSN 1651-7660 ; 2015:74
near-field acoustic holography, field separation techniques, single layer, space-invariance, reflective envirionments
närfält akustisk holografi, fältseparationstekniker, enkelt lager, utrymmes invarians, reflekterande miljöer
Fluid Mechanics and Acoustics Signal Processing
Research subject Vehicle and Maritime Engineering
IdentifiersURN: urn:nbn:se:kth:diva-176467ISBN: 978-91-7595-722-7OAI: oai:DiVA.org:kth-176467DiVA: diva2:867521
2015-11-10, K51, Teknikringen 28, Stockholm, 10:15 (English)
Fernandez-Grande, Efren, Assistant Professor
Lopez Arteaga, Ines, Professor
FunderSwedish Research Council, SDA26628
QC 201511062015-11-062015-11-052015-11-06Bibliographically approved