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22 May 2002 Visualization and measurement of acoustic and fluidic phenomena using a laser-scanning vibrometer
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Proceedings Volume 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (2002) https://doi.org/10.1117/12.468183
Event: Fifth International Conference on Vibration Measurements by Laser Techniques, 2002, Ancona, Italy
Abstract
A new method for non-interactively measuring and visualising turbulences, e.g. vortexes, and acoustic sound waves in gases is described. The measuring effect is based on the path difference ?? between two interfering laser beams. This difference results from changes of the refractive index n, caused by pressure fluctuations p(t) in a measuring volume. The method is practicable in both the audio and the ultrasonic ranges, as well as for spatially small turbulences. It is adequate for the investigation and demonstration of numerous acoustic, fluidic and fluid-acoustic phenomena.
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Lothar Zipser and Heinz Franke "Visualization and measurement of acoustic and fluidic phenomena using a laser-scanning vibrometer", Proc. SPIE 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2002); https://doi.org/10.1117/12.468183
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