Optical sound field measurement and imaging using laser and high-speed camera

Yasuhiro Oikawa, Kohei Yatabe, Kenji Ishikawa, Yusuke Ikeda

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    14 Citations (Scopus)

    Abstract

    Optical sound measurement, which acquires acoustical quantities by means of optical techniques, is of growing interest as an alternative method for the sound field imaging. There are two remarkable aspects of the optical sound measurement. The first is non-intrusiveness. Since the measurement is achieved by observing the light passed through the sound field, the instruments can be arranged outside the measurement field; non-contact and non-destructive measurement can be achieved. The second one is spatial resolution. Instead of building an array, expanding or scanning of light are often used for the optical imaging. Therefore, the optical imaging does not have the limitation of interval of measurement points due to the size of the instruments as microphone arrays. These two aspects make the optical method possible to image sound field with high spatial resolution and without any disturbance to the original field. In this paper, we show several methods for the optical sound imaging. Laser Doppler vibrometer can be developed as the imaging methods by scanning a narrow light beam. The two dimensional of transient field measurement can be achieved by using a high-speed camera because of single-shot. In addition some signal processing techniques introduced to optical measurement are also described.

    Original languageEnglish
    Title of host publicationProceedings of the INTER-NOISE 2016 - 45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future
    PublisherGerman Acoustical Society (DEGA)
    Pages258-266
    Number of pages9
    Publication statusPublished - 2016 Aug 21
    Event45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future, INTER-NOISE 2016 - Hamburg, Germany
    Duration: 2016 Aug 212016 Aug 24

    Other

    Other45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future, INTER-NOISE 2016
    CountryGermany
    CityHamburg
    Period16/8/2116/8/24

    Keywords

    • Acousto-optic effect
    • Laser Doppler vibrometer (LDV)
    • Parallel phase-shifting interferometry (PPSI)
    • Physical-model based signal processing

    ASJC Scopus subject areas

    • Acoustics and Ultrasonics

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  • Cite this

    Oikawa, Y., Yatabe, K., Ishikawa, K., & Ikeda, Y. (2016). Optical sound field measurement and imaging using laser and high-speed camera. In Proceedings of the INTER-NOISE 2016 - 45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future (pp. 258-266). German Acoustical Society (DEGA).