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Journal of Flow Visualization and Image Processing
SJR: 0.11 SNIP: 0.312 CiteScore™: 0.1

ISSN Druckformat: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v16.i4.10
pages 279-293

THE APPLICATION OF THE COLORED BACKGROUND ORIENTED SCHLIEREN TECHNIQUE (CBOS) TO WIND TUNNEL, FREE-FLIGHT AND IN-FLIGHT MEASUREMENTS

Friedrich Leopold
Head, Aerodynamic: Measurements and Simulation French-German Research Institute of Saint-Louis, 5 rue du Général Cassagnou BP 70034, 68301 Saint-Louis Cedex, France Germany Address: Postfach 1260, 79547 Weil am Rhein, Germany

ABSTRAKT

The improved background oriented schlieren technique CBOS (Colored Background Oriented Schlieren) is presented in this paper. This technique measures the light deflection caused by density gradients in a compressible flow. For this purpose, the CBOS technique uses the distortion of a background image. In order to increase the performance of the conventional Background Oriented Schlieren technique (BOS) the monochromatic background is replaced by a colored dot pattern. The different colors are treated separately. Therefore, the precision and the spatial resolution can be increased. The CBOS technique is applied in order to measure the flow around test models in a supersonic wind tunnel, during free-flight and full-scale flight tests with a helicopter.

REFERENZEN

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  3. U. Kopf, Application of Speckling for Measuring the Deflection of Laser Light by Phase Objects.

  4. U. Wernekink and W. Merzkirch, Speckle Photography of Spatially Extended Refractive-Index Fields.

  5. R. Niessen, H. J. Schafer, and W. Merzkirch, Measurement of Length Scales in the Turbulent Wake behind a Cylindrical Body at Supersonic Flow Velocities.

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  9. E. Augenstein, F. Leopold, H. Richard, and M. Raffel, Schlieren Techniques in Comparison: Background Oriented Scattering versus Visualization with Holographic Filters.

  10. F. Leopold, J. Simon, D. Gruppi, and H. J. Schafer, Recent Improvements of the Background Oriented Schlieren Technique (BOS) by Using a Colored Background.

  11. J. Westerweel, Digital Particle Image Velocimetry, Theory and Application.

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