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Optical techniques offer a lot of advantages for high-speed flow measurements. However, most wind tunnels have flat windows to accommodate light passing through. A modification is made for a specific type of interferometer to work with curved windows instead.
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This page is a summary of: Focused Laser Differential Interferometry with Contoured Tunnel Windows, AIAA Journal, February 2021, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/1.j060081.
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