Natural-background-oriented schlieren imaging |
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Authors: | Michael John Hargather Gary S Settles |
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Institution: | (1) Penn State Gas Dynamics Laboratory, Pennsylvania State University, 301D Reber Building, University Park, PA 16802, USA |
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Abstract: | The background-oriented schlieren (BOS) flow visualization method has the potential for large-scale flow imaging outside the
laboratory by using natural backgrounds instead of the artificial patterns normally used indoors. The natural surroundings
of an outdoor test site can sometimes be used as such a background, subject to criteria of fine scale, randomness and contrast
that are developed here. Some natural backgrounds are more appropriate than others for a given application. Backgrounds used
here to visualize both high- and low-speed schlieren disturbances include a sunlit cornfield and a backlit grove of trees.
A range of image post-processing methods is considered for qualitative BOS. It is found that high sensitivity and a broad
measuring range are in conflict here, much as they are in traditional schlieren instruments. Applications of natural-BOS include
explosive characterization, firearms and artillery testing, chemical and natural-gas leak detection, and related phenomena. |
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Keywords: | |
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