Non-intrusive sound pressure measurement using light scattering

Kenji Ishikawa, Yasuhiro Oikawa, Yoshio Yamasaki

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    Light propagating through a sound field is affected by variations in the density of the medium caused by sound. Therefore, acoustical measurements using light have been studied. The popular measurement methods use the phase shift of the transmitted light. Because they detect integrated acoustical quantities along the optical path of the detected light, time and effort are required to measure the quantities at a single point. On the other hand, single-point acoustical particle velocity measurement by light scattering has been proposed. Using light scattering enables the measurement of non-integrated quantities because the scattered light includes only the acoustical information at a scattering point. However, a method of non-invasive sound pressure measurement at a single point in a free field has not been established. This paper proposes sound pressure measurement at a scattering point, in which the light scattered by particles in the sound field is observed. The intensity of light scattered in the sound field indicates the sound pressure because the intensity of the scattered light is proportional to the density of scatterers. The theory of light scattering by sounds is formalized, and sound measurement experiments with light scattering are also conducted using water drops and air particles as scatterers.

    Original languageEnglish
    Pages (from-to)408-418
    Number of pages11
    JournalAcoustical Science and Technology
    Volume36
    Issue number5
    DOIs
    Publication statusPublished - 2015

    Fingerprint

    pressure measurement
    sound pressure
    light scattering
    sound fields
    scattering
    acoustic measurement
    acoustics
    optical paths
    velocity measurement
    phase shift
    air
    water

    Keywords

    • Acoustical metrology
    • Light scattering
    • Optical measurement

    ASJC Scopus subject areas

    • Acoustics and Ultrasonics

    Cite this

    Non-intrusive sound pressure measurement using light scattering. / Ishikawa, Kenji; Oikawa, Yasuhiro; Yamasaki, Yoshio.

    In: Acoustical Science and Technology, Vol. 36, No. 5, 2015, p. 408-418.

    Research output: Contribution to journalArticle

    Ishikawa, Kenji ; Oikawa, Yasuhiro ; Yamasaki, Yoshio. / Non-intrusive sound pressure measurement using light scattering. In: Acoustical Science and Technology. 2015 ; Vol. 36, No. 5. pp. 408-418.
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