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Elsinga, G.E. (author), Van Oudheusden, B.W. (author), Scarano, F. (author)In compressible flows particle imaging, as done in Particle Image Velocimetry (PIV), is far from trivial. The inhomogeneous refractive index field can cause aero-optical aberrations including blurring of the image, especially near optical interfaces such as shock waves. The understanding of the process causing particle image blur (or blurring of...conference paper 2005