Projection background-oriented schlieren

A background-oriented schlieren (BOS) system is developed with two benefits over traditional BOS systems. First, the dot pattern required for BOS is projected onto a retroreflective background instead of being painted/printed onto the material itself, allowing for on-the-fly updates to the size and...

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Bibliographic Details
Published in:Applied optics (2004) 2022-07, Vol.61 (20), p.6006
Main Authors: Weisberger, Joshua M., Bathel, Brett F.
Format: Article
Language:English
Subjects:
Image acquisition
Optical polarization
Optimization
Wind tunnels
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Description
Summary:A background-oriented schlieren (BOS) system is developed with two benefits over traditional BOS systems. First, the dot pattern required for BOS is projected onto a retroreflective background instead of being painted/printed onto the material itself, allowing for on-the-fly updates to the size and distribution of the dot pattern. Second, a reference image is acquired for every flow image so that real-time BOS images can be displayed, and a flow-off reference image need not be acquired if the projected dot pattern is changed during a run for BOS signal optimization. The system can be made very compact, can be converted quickly to operate as a shadowgraph system, and can be integrated with polarization optics that reduce glare/reflections from wind tunnel windows.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.458770