10 February 2009 Short and long LED flashes to study flow in air and water and why it might be better to use a long exposure time
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Proceedings Volume 7126, 28th International Congress on High-Speed Imaging and Photonics; 71260Y (2009) https://doi.org/10.1117/12.821848
Event: 28th International Congress on High-Speed Imaging and Photonics, 2008, Canberra, Australia
Abstract
We show bubbles investigated with videography and multiple colour LED flash illumination. The short flashes show the propagation and development of the shape of the bubbles. The long flashes make the velocity vector of the bubbles directly visible and allow easy investigation of the unstable movement. If bubbles are used to reduce friction of ships, then it is effective to spread the gas volume over lots of micro bubbles. Another experiment is the investigation of the noise of a bass reflex loud-speaker. The visualisation of air flow shows linear behaviour at low power and a previously unknown effect at high power - continuous streaming of air in the bass reflex tube.
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R. Germer, "Short and long LED flashes to study flow in air and water and why it might be better to use a long exposure time", Proc. SPIE 7126, 28th International Congress on High-Speed Imaging and Photonics, 71260Y (10 February 2009); doi: 10.1117/12.821848; https://doi.org/10.1117/12.821848
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