Wind tunnel experiments often includes optical diagnostic of the flow. It is mostly used only for obtaining qualitative information on flow structure. However, interference methods also can provide quantitative information on density variations along the optical path length. A change in density of studied flow inhomogeneities leads to shift of fringes in the interference pattern. The results of the application of the optical method for determining the integral density field during the study of a vortex wing wake are presented. The optical diagnostics of the flow was performed by means of adaptive visualizing transparencies based on the saturation of absorption effect. To translate infinite interference fringes into finite ones, an optical wedge was used. The principal possibility of using the method for obtaining quantitative data on flow parameters in the study of the longitudinal end vortex is shown.
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