Simultaneous imaging of flow and sound using high-speed parallel phase-shifting interferometry
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...
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Veröffentlicht in: | Optics letters 2018-03, Vol.43 (5), p.991-994 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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. |
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ISSN: | 0146-9592 1539-4794 |
DOI: | 10.1364/ol.43.000991 |