Sound field reconstruction based on the acousto-optic effect

Antoni Torras Rosell, Salvador Barrera Figueroa, Finn Jacobsen

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    Acoustic measurements are usually carried out with transducers that interact mechanically with the sound field under investigation. The goal of this work is to employ a completely different measurement principle, the determination of sound pressure based on the interaction between sound and light, namely the acousto-optic effect. When sound propagates through a medium, it gives rise to pressure fluctuations that change the instantaneous density of the medium. Under such circumstances, the speed of light is not constant, but changed by the acoustic field. This acousto-optic interaction can be measured with a laser Doppler vibrometer; furthermore, it can be exploited to characterize an arbitrary sound field using tomographic techniques. This paper briefly reviews the fundamental principles governing the acousto-optic effect in air, and presents an investigation of the tomographic reconstruction within the audible frequency range by means of simulations and experimental results. The good agreement observed between simulations and measurements is further confirmed with representations of the sound field obtained with traditional microphone array measurements.
    Original languageEnglish
    Title of host publicationINTER- NOISE 2011 Proceedings
    Publication date2011
    Publication statusPublished - 2011
    EventINTER-NOISE 2011 : 40th International Congress and Exposition on Noise Control Engineering - Osaka, Japan
    Duration: 4 Sept 20117 Sept 2011
    Conference number: 40


    ConferenceINTER-NOISE 2011 : 40th International Congress and Exposition on Noise Control Engineering


    • Tomography
    • Sound field reconstruction
    • Acousto-optic effect


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