Lit_Review_Pres_1-17 - Observe displacement of background...

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Background Oriented Schlieren Landon Baur John Tapee
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Classical Schlieren Setup Index of refraction is proportional to density Sensitive to density gradient in transparent medium Works best in 2D environment where collimated light rays are perpendicular to flow phenomena Sketch of optical arrangement for classical schlieren method (from “Whole-field density measurements by ‘synthetic schlieren’” by S.B. Dalziel, G.O. Hughes, B.R. Sutherland)
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Sample Schlieren Images Supersonic Nozzle ( from “Computerized background- oriented schlieren” by G.E.A. Meier ) Wedge in Supersonic Flow (from “Density measurements using the Background Oriented Schlieren technique” by L. Venkatakrishnan, G.E.A. Meier)
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Real World Examples Refractive phenomena visible to naked eye given the right lighting and background conditions Need distinct, light/dark contrasting background http://www.andrewgraves.biz/ssc_stuff/SSC_pics.htm
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Background Oriented Schlieren Abbreviated “BOS”, also called “Synthetic Schlieren”
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Unformatted text preview: Observe displacement of background image caused by density gradients in wind tunnel Eliminates need for expensive optics Only need camera, background, and optical windows In concept, more easily scalable to different model sizes Representative BOS Setup (from Density measurements using the Background Oriented Schlieren technique by L. Venkatakrishnan, G.E.A. Meier) Sample BOS: Wedge Shock pattern not visible to naked eye Raw background image (a) without flow and (b) with supersonic flow from Density measurements using the Background Oriented Schlieren technique by L. Venkatakrishnan, G.E.A. Meier Sample BOS: Wedge Displacement vectors Density Field Sample BOS: Wedge Computed Schlieren Classical Schlieren Varying Background Types Oscillating cylinder Images show calculated density perturbation Lines Dots at Constant Spacing Random Dots from Synthetic Schlieren by Stuart B Dalziel, Graham O Hughes & Bruce R Sutherland...
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This note was uploaded on 01/15/2012 for the course AAE 490 taught by Professor Andrisani during the Fall '09 term at Purdue University-West Lafayette.

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Lit_Review_Pres_1-17 - Observe displacement of background...

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