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An experiment called Schlieren and held at Harvard University, allows visualization of motion of air and other gases. Schlieren method is an optical imaging technique, with which we can see small changes in the refractive index of air. A light source reflected from a concave mirror and focuses on the edge of a razor blade, which is positioned in front of the camera. Light is refracted near the mirror and when deflected from the blade gives the illusion of a shadow.
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"The technique takes its name from the German word" slire ", which is rendered in Greek as streak, and it comes in
striped nature of fluid flow image as pictured with this technique.
Imaging systems and provisions of Fluting, have been used since the 17th century, as
for example by Robert Hooke, who presented the results of applying a similar technique in candle flame and dissolution of solid substances in liquids in the British Royal Society, and Christiaan Huygens, who almost simultaneously developed a technique for identifying such ribs (result anomoiomorfiwn) in optical elements.
In the mid-19th century Léon Foucault, developed layout
control by using pointed object for telescope mirrors for use in air-flow Imaging. "
2.4.2 (in Greek): https://apothesis.lib.teicrete.gr/bitstream/handle/11713/7788/SkarouAlexia2016.pdf?sequence=1
https://en.wikipedia.org/wiki/Schlieren_imaging
https://en.wikipedia.org/wiki/Schlieren