Schlieren is an optical technique used to visualize variations in the density of transparent media, such as air or gases. It is often used to study fluid dynamics, such as the flow of gases around objects or shock waves in supersonic aircraft.
The Schlieren technique involves using a collimated light source, such as a laser or bright point source, to illuminate the region of interest. The light passes through a curved mirror or lens, which focuses the light into a narrow beam. The beam then passes through the transparent medium being studied and is deflected by the density gradients in the medium.
A second curved mirror or lens is used to refocus the deflected light onto a screen or camera. The density gradients in the medium cause the light to bend and produce bright or dark regions on the screen, which can be used to visualize the density variations in the medium.
Schlieren imaging can be used to study a wide range of phenomena, from the behavior of flames and explosions to the airflow around cars or airplanes. It is also used in medical research to study the flow of fluids in the human body.
Monday, March 13, 2023
Schlieren
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