Abstract
A novel technique is presented for quantitative data acquisition regarding the motion of a pair of vortex filaments in a water tunnel. This technique allows measuring the vortex strength, the oscillation frequency of the vortex filaments, and the rate of growth of their amplitudes simultaneously. The filaments are visualized using dye injection while their cross sections are illuminated with light sheets at different downstream locations and recorded. Time history of the vortex position is extracted from these recordings. This measurement technique is shown to be a viable method of analyzing wake vortex motion. Pairs of vortex filaments, typical of those of wingtips, are used in a water tunnel to demonstrate the application of the method. Vortex strength and the distance between the filaments are varied independently, and the motions of the vortex pairs are quantified
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