Simultaneous imaging of flow and sound using high-speed parallel phase-shifting interferometry

Kenji Ishikawa*, Risako Tanigawa, Kohei Yatabe, Yasuhiro Oikawa, Takashi Onuma, Hayato Niwa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)


In this Letter, simultaneous imaging of flow and sound by using parallel phase-shifting interferometry and a high-speed polarization camera is proposed. The proposed method enables the visualization of flow and sound simultaneously by using the following two factors: (i) injection of the gas, whose density is different from the surrounding air, makes the flow visible to interferometry, and (ii) time-directional processing is applied for extracting the small-amplitude sound wave from the high-speed flow video. An experiment with a frame rate of 42,000 frames per second for visualizing the flow and sound emitted from a whistle was conducted. By applying time-directional processing to the obtained video, both flow emitted from the slit of the whistle and a spherical sound wave of 8.7 kHz were successively captured.

Original languageEnglish
Pages (from-to)991-994
Number of pages4
JournalOptics Letters
Issue number5
Publication statusPublished - 2018 Mar 1

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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