Planar Laser Induced Fluorescence has been introduced as a method of studying water drop impacting deep water pool, specifically the penetration a drop after collision. The general formulation and law behind the PLIF method was formulated. Then, the experimental setup is described. Finally, three series of images taken from drops with different impact speeds (Weber numbers) are shown and the data that can be extracted from them are illustrated. The photos show the vortex ring produced by drop impact at low impact speeds. This ring will cause the drop to penetrate faster and deeper than higher impact velocities without mentioned vortex ring.

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