We show that when a drop of water is maintained in its Leidenfrost regime, a sound in the form of periodic beats emits from the drop. The process of beat emission involves two distinct frequencies. One component is the frequency of beats itself, and the second is the frequency of sound in every beat which is emitted when one oscillation in the drop occurs. Experiments were performed by placing a drop of water over a concave metallic surface, and the beats of the drop were recorded by fixing a microphone above the drop. A video camera was also fixed above the drop to record its oscillations. Simple analytical techniques like Fourier and wavelet transforms of the audio signals and image processing of the videos of the drop were used to gain insight into the mechanism of the beat emission process. This analysis also helped us in studying the dependence of frequencies, if any, on the radius of the drop and the substrate temperature.

中文翻译：

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莱顿霜滴的声音

我们表明，当水滴保持在莱顿弗罗斯特状态时，水滴会发出周期性节拍形式的声音。拍频发射过程涉及两个不同的频率。一个成分是拍子本身的频率，第二个是拍子中发生一次振荡时发出的每个拍子中声音的频率。通过将一滴水放在凹形的金属表面上进行实验，并通过将麦克风固定在水滴上方来记录水滴的节拍。摄像机还固定在水滴上方，以记录其振动。音频信号的傅立叶和小波变换以及液滴视频的图像处理等简单分析技术可用于深入了解节拍发射过程的机理。