= Schlieren imaging
{wiki=Schlieren_imaging}
Schlieren imaging is an optical technique used to visualize the flow of fluids and changes in refractive index, typically in gases. It allows researchers and engineers to see phenomena that are otherwise invisible, such as shock waves, temperature variations, and the effects of turbulence. The basic principle of Schlieren imaging relies on the refraction of light. When light passes through a medium with varying density (like air with a temperature gradient), the light rays are bent or refracted.
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