Fig. 5

An example of HF wave (case 3). \(V = 0.6\) \(\text{ cm}^3\) hemispherical cap bubble bursts in a suspension of \(\phi = 0.3\). a Time-lapse images (see Additional file 1: Movie 1). Blue \(\times\) : before bursting, \(\bigcirc\) : after bursting, red \(\times\) : film disappearance. Red arrows indicate the aperture. b Waveform (detrended, highpass filtered at 800 Hz). Markers correspond to the timing shown in (a) and are plotted at the end of the exposure time of each image. c Spectrogram of (b) using a 0.512 ms sliding window and a 0.5 ms overlap