Acousto-optic back-projection: Physical-model-based sound field reconstruction from optical projections. (28th April 2017)

• Record Type: Journal Article
• Authors: Yatabe, Kohei; Ishikawa, Kenji; Oikawa, Yasuhiro
• Is Part Of: Journal of sound and vibration. Volume 394(2017)
• Page Start: 171
• Page End: 184
• Publication Date: 2017-04-28
• Subjects: Optical sound measurement -- Computed tomography (CT) -- Laser Doppler vibrometer (LDV) -- Herglotz wave function -- Spherical harmonics; Sound -- Periodicals; Vibration -- Periodicals; Son -- Périodiques; Vibration -- Périodiques; Sound; Vibration; Periodicals; Electronic journals; 620.205
• DOI: 10.1016/j.jsv.2017.01.043
• Languages: English
• ISSNs: 0022-460X

Abstract

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.