The drainage process of a landed soap bubble has been studied using the large lateral shearing displacement interferometry. The film thickness in height and time can be quantitatively measured with a standard deviation about 0.04 µm. In the drainage process, the maximum film thickness is 4.78 µm, the maximum film volume is 5.52, the maximum volume flow is 0.234/, and the maximum drainage flow rate is about 1.27 mm/s. Once the drained zone occurs, the drainage flow rate becomes about twice as before. The simulative fringe patterns based on the measurement results are in good agreement with the experimental ones in most areas.
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