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Schlieren Optics

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Schlieren flow visualization and photography is one of those things that is just too cool. Using an optical trick, it allows a camera to capture, “small changes in the index of refraction in air.” In other words, it can see anything that affects airflow: heat, sound waves, or just plain old air currents themselves................

http://petapixel.com/2014/11/24/see-airflow-camera-awesome-harvard-demonstration-schlieren-optics/

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