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Background Oriented Schlieren Method (BOS)
The Background Oriented Schlieren Method is a very simple technique to visualize density gradients, that base on the deviation of light rays due to refractive index changes. The technique can be applied for all kinds of refractive indices. Even very weak density gra-dients cause refractive indices, which can be detected safely. E.g. the convection of warm air over a human hand in a normal temperatured room can be visualizes as well as it is possible to determine the tenth of a percent of a Helium plume in air.
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