Fernandez Grande, Efren

Jacobsen, Finn

Torras Rosell, Antoni

Recent studies have shown that it is possible to measure a sound field using acousto-optic tomography. Theacousto-optic effect, i.e., the interaction between sound and light, can be used to measure an arbitrary soundfield by scanning it with a laser Doppler vibrometer (LDV) over an aperture; This can be described mathematically by means of the Radon transform of the acoustic field. An interesting feature of this Measurement technique is that the spatial characteristics of the sound field are captured in the measurement. Therefore, the technique has an inherent holographic potential, implicitly yielding a full characterization of the sound field. In this study, a direct projection of the Radon transform from one plane to another and into the space domain, based on an elementary wave expansion is proposed. The relationship between the Radon and the wavenumber domains is examined, and the reconstruction potential of the method analyzed. The study includes both numerical and experimental results

Online Research Database In Technology

Holographic reconstruction of sound fields based on the acousto-optic effect - DTU Orbit(09/11/2017) Holographic reconstruction of sound fields based on the acousto-optic effectRecent studies have shown that it is possible to measure a sound field using acousto-optic tomography. Theacousto-opticeffect, i.e., the interaction between sound and light, can be used to measure an arbitrary soundfield by scanning it with alaser Doppler vibrometer (LDV) over an aperture; This can be described mathematically by means of the Radon transformof the acoustic field. An interesting feature of this Measurement technique is that the spatial characteristics of the soundfield are captured in the measurement. Therefore, the technique has an inherent holographic potential, implicitly yielding afull characterization of the sound field. In this study, a direct projection of the Radon transform from one plane to anotherand into the space domain, based on an elementary wave expansion is proposed. The relationship between the Radonand the wavenumber domains is examined, and the reconstruction potential of the method analyzed. The study includesboth numerical and experimental results. General informationState: PublishedOrganisations: Department of Electrical Engineering, Acoustic TechnologyAuthors: Fernandez Grande, E. (Intern), Torras Rosell, A. (Intern), Jacobsen, F. (Intern)Number of pages: 10Publication date: 2013 Host publication informationTitle of host publication: Proceedings of Internoise 2013Main Research Area: Technical/natural sciencesConference: INTER-NOISE 2013, Innsbruck, Austria, 15/09/2013 - 15/09/2013Near-field acoustic holography (NAH), Sound visualization, Acousto-optic effectElectronic versions: InterNoise2013_EWM_Efren_final_OK.pdf Source: dtuSource-ID: u::8807Publication: Research - peer-review › Article in proceedings – Annual report year: 2013 

Holographic reconstruction of sound fields based on the acousto-optic effect

http://orbit.dtu.dk/en/publications/holographic-reconstruction-of-sound-fields-based-on-the-acoustooptic-effect(84ba601b-0d33-450e-9be9-4964ca210578).pdf?nofollow=true&rendering=long

Holographic reconstruction of sound fields based on the acousto-optic effect

Abstract

Similar works

Full text

Available Versions

Online Research Database In Technology