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Quantitative Measurement and Reconstruction of 3D Density Field by CGBOS (Colored Grid Background Oriented Schlieren) Technique

  • M. Ota
  • H. Kato
  • R. Sakamoto
  • K. Maeno

Introduction

The Background Oriented Schlieren (BOS) technique was proposed by Meier [1], and it enables us to have the quantitative density measurement with computer-aided image analysis. In the past several years, BOS technique had applied to various experiments [2],[3]. The principle of BOS is similar to conventional Schlieren technique, it exploit the bending of light caused by refractive index change corresponding to density change in the medium and both techniques are sensitive to density gradient. Conventional Schlieren technique employs many optical elements - pinhole, concave mirror, knife edge or color filter, camera...etc, however it is difficult to realize quantitative measurement and this technique is commonly used for qualitative measurement like flow visualization. On the other hand BOS requires only a background and a digital still camera and it can realize the quantitative measurement of density.

Keywords

Particle Image Velocimetry Expansion Wave Asymmetric Model Background Oriented Schlieren Supersonic Wind Tunnel 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Meier, G.E.A.: Computerized background-oriented schlieren. Exp. Fluids 33, 181–187 (2002)Google Scholar
  2. 2.
    Leoplod, F., Simon, J., Gruppi, D., Schäfer, H.J.: Recent improvements of the background oriented schlieren technique (BOS) by using a colored background. In: Proc. 12th ISFV @ Göttingen, Germany, ISFV12-3.4 (2006)Google Scholar
  3. 3.
    Venkatakrishnan, L., Meier, G.E.A.: Density measurements using the Background Oriented Schlieren technique. Exp. Fluids 37, 237–247 (2004)CrossRefGoogle Scholar
  4. 4.
    Ota, M., Inage, T., Maeno, K.: An extension of laser-interferometric CT measurement to unsteady shock waves and 3D flow around a columnar object. Flow Meas. Inst. 18, 295–300 (2007)CrossRefGoogle Scholar
  5. 5.
    Ota, M., Koga, T., Maeno, K.: Laser interferometric CT measurement of the unsteady supersonic shock-vortex flow field discharging from two parallel and cylindrical nozzles. Meas. Sci. Tech. 17(8), 2066–2071 (2006)CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • M. Ota
    • 1
  • H. Kato
    • 2
  • R. Sakamoto
    • 2
  • K. Maeno
    • 1
  1. 1.Graduate School of EngineeringChiba UniversityChibaJapan
  2. 2.Graduate Student, Graduate School of EngineeringChiba UniversityChibaJapan

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