Density Measurement of Large Scale Transonic Flow Fields

  • G. E. A. Meier
  • B. Stasicki
Part of the Fluid Mechanics and its Applications book series (FMIA, volume 73)


Density gradients are recorded by interferometric or by schlieren techniques. Both methods require complicated optical set-ups and provide limited field sizes. A new type of computerised schlieren system has very few optical elements and no field limitation. Background Oriented Schlieren (BOS) uses distorted images of reference objects, caused by density gradients (schlieren) in light scattering flows or waves, to get information about these waves. Comparison of a distorted with an undistorted image of a deliberately structured background provides the density gradients.

Key words

transonic flow density gradients computerised schlieren system vector fields 


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Copyright information

© Springer Science+Business Media Dordrecht 2003

Authors and Affiliations

  • G. E. A. Meier
    • 1
  • B. Stasicki
    • 2
  1. 1.University of HannoverHannoverGermany
  2. 2.DLR-Institute of Aerodynamics and Flow TechnologyGöttingenGermany

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