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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1. Ἀstronomos says:

   23/06/2017 at 12:54

   'The technique takes its name from the German word' slire ', which is rendered in Greek as streak, και αφορά στηνραβδωτή φύση της εικόνας της ροής των ρευστών όπως απεικονίζεται με την τεχνική αυτή.Απεικονιστικά συστήματα και διατάξεις ράβδωσης, have been used since the 17th century, όπωςγια παράδειγμα από τον Ρόμπερτ Χουκ, 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) σε οπτικά στοιχεία.Στα μέσα του 19ου αιώνα ο Λεόν Φουκώ, ανέπτυξε διάταξηελέγχου με χρήση αιχμηρού αντικειμένου για καθρέπτες τηλεσκοπίων για χρήση σε απεικόνιση ροών αέρα.»2.4.2 (in Greek): https://apothesis.lib.teicrete.gr/bitstream/handle/11713/7788/SkarouAlexia2016.pdf?sequence=1https://en.wikipedia.org/wiki/Schlieren_imaginghttps://en.wikipedia.org/wiki/Schlieren

   

   

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