Interferometric imaging of acoustical phenomena using high-speed polarization camera and 4-step parallel phase-shifting technique

K. Ishikawa, K. Yatabe, Y. Ikeda, Y. Oikawa, T. Onuma, H. Niwa, M. Yoshii

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

9 Citations (Scopus)

Abstract

Imaging of sound aids the understanding of the acoustical phenomena such as propagation, reflection, and diffraction, which is strongly required for various acoustical applications. The imaging of sound is commonly done by using a microphone array, whereas optical methods have recently been interested due to its contactless nature. The optical measurement of sound utilizes the phase modulation of light caused by sound. Since light propagated through a sound field changes its phase as proportional to the sound pressure, optical phase measurement technique can be used for the sound measurement. Several methods including laser Doppler vibrometry and Schlieren method have been proposed for that purpose. However, the sensitivities of the methods become lower as a frequency of sound decreases. In contrast, since the sensitivities of the phase-shifting technique do not depend on the frequencies of sounds, that technique is suitable for the imaging of sounds in the low-frequency range. The principle of imaging of sound using parallel phase-shifting interferometry was reported by the authors (K. Ishikawa et al., Optics Express, 2016). The measurement system consists of a high-speed polarization camera made by Photron Ltd., and a polarization interferometer. This paper reviews the principle briefly and demonstrates the high-speed imaging of acoustical phenomena. The results suggest that the proposed system can be applied to various industrial problems in acoustical engineering.

Original languageEnglish
Title of host publicationSelected Papers from the 31st International Congress on High-Speed Imaging and Photonics
EditorsTakeharu Goji Etoh, Hiroyuki Shiraga, Takeharu Goji Etoh
PublisherSPIE
ISBN (Electronic)9781510611009
DOIs
Publication statusPublished - 2017
Event31st International Congress on High-Speed Imaging and Photonics - Osaka, Japan
Duration: 2016 Nov 62016 Nov 10

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10328
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

Other31st International Congress on High-Speed Imaging and Photonics
Country/TerritoryJapan
CityOsaka
Period16/11/616/11/10

Keywords

  • Acousto-optic effect
  • Loudspeaker
  • Quantitative measurement
  • Sound

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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