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The phase-schifting schlieren

“The schlieren technique is a popular for depicting deviations in light beams induced by density or temperature gradients in a fluid, surface shape, deformation, etc.1 The technique has many applications, in particular, fluid physics, flow illustration, and jet_arc characterization. Its success is due to its relative easy of implementation, low cost, use of conventional light sources, and high and variable sensitivity.”

From L. Joannes, F. Dubois, JC. Legros, Phase-shifting schlieren: high-resolution quantitative schlieren that uses the phase-shifting technique principle, Applied Optics Vol. 42, No. 25, 1 September 2003