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.

中文翻译：

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使用高速并行相移干涉仪同时成像流动和声音

在这封信中，提出了通过使用平行相移干涉术和高速偏振相机同时成像流动和声音的技术。所提出的方法通过使用以下两个因素，可以同时可视化流动和声音：（i）注入密度不同于周围空气的气体，从而使流动对干涉仪可见，以及（ii）时间方向处理用于从高速流视频中提取小振幅声波。进行了每秒42,000帧的帧速率的实验，以可视化哨子的流动和声音。通过对所获得的视频进行时间方向的处理，从口哨的缝隙发射的流和8.7kHz的球形声波被相继捕获。