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BOS imaging of a thermal flow

Background Oriented Schlieren: BOS Imaging

For the visualization of gas motion based on local refractive index variations Background Oriented Schlieren (BOS, also known as Synthetic Schlieren) is a simple and cost-effective alternative to laser imaging methods, because it doesn’t need any complex illumination device like a laser needed for laser imaging, and it works without seeding the flow.

BOS is a line-of-sight imaging technique and measures locally the density gradient as an integrated value over the line-of-sight. In practice, only a random dot pattern in the background of the flow is imaged with a high resolution camera before and during the test. By comparing the two pictures (or more precisely correlating the two patterns similar to the image correlation in PIV) the local displacement of the background pattern can be used to provide lateral information on path-integrated refractive index variations.

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Thermal flow visualization (Schlieren image) around a heated building model
 

Although BOS is able to qualitatively visualize the smallest changes in gas density, its line-of-sight imaging technique can only measure absolute density (temperature) fields in 2D or in axisymmetric flows a feature supported in LaVision’s BOS imaging systems.

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Thermal flow visualization of a propane Bunsen flame
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3D temperature distribution p of a Bunsen flame measured with
LaVision‘s BOS imaging system
BOS
Imaging in Transparent Media
  • simple flow visualization technique without laser and flow seeding
  • advanced image correlation technique applied on background target
  • BOS software module in DaVis for quantitative density (temperature)
    imaging in 2D and axisymmetric flows

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