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The background oriented schlieren (BOS) technique is one of the visualization techniques that enable the quantitative measurement of density information in the flow field with very simple experimental setup. The principle of BOS technique is similar to the conventional schlieren technique which exploit the vending of light rays passing through the density gradient. BOS utilize the background and measure the displacement of the background image quantitatively by image analysis. In this report we propose the stripe-patterned background oriented schlieren (SPBOS) technique using striped background pattern. A measurement of supersonic flow field around an asymmetric body is tested at a JAXA-ISAS supersonic wind tunnel to realize the three-dimensional and quantitative density measurement.

Three-Dimensional CT Measurement of Supersonic Flow Field around an Asymmetric Body by Background Oriented Schlieren (BOS) Technique