Acousto-optic back-projection: Physical-model-based sound field reconstruction from optical projections

Kohei Yatabe, Kenji Ishikawa, Yasuhiro Oikawa

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

As an alternative to microphones, optical techniques have been studied for measuring a sound field. They enable contactless and non-invasive acoustical observation by detecting density variation of medium caused by sound. Although they have important advantages comparing to microphones, they also have some disadvantages. Since sound affects light at every points on the optical path, the optical methods observe an acoustical quantity as spatial integration. Therefore, point-wise information of a sound field cannot be obtained directly. Ordinarily, the computed tomography (CT) method has been applied for reconstructing a sound field from optically measured data. However, the observation process of the optical methods have not been considered explicitly, which limits the accuracy of the reconstruction. In this paper, a physical-model-based sound field reconstruction method is proposed. It explicitly formulates the physical observation process so that a model mismatch of the conventional methods is eliminated.

Original languageEnglish
Pages (from-to)171-184
Number of pages14
JournalJournal of Sound and Vibration
Volume394
DOIs
Publication statusPublished - 2017 Apr 28

Keywords

  • Computed tomography (CT)
  • Herglotz wave function
  • Laser Doppler vibrometer (LDV)
  • Optical sound measurement
  • Spherical harmonics

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Acoustics and Ultrasonics
  • Mechanical Engineering

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