Schlieren photography

Schlieren photography is a technique used to visualize changes in the density of transparent materials, such as air or water. It works by detecting variations in light caused by differences in density, which occur when temperature, pressure, or concentration changes. When light passes through these varying densities, it bends slightly, creating distortions. A Schlieren setup typically involves a light source, a lens, and a camera, capturing the visual effects of these density changes as striking images. This method is often employed in scientific research and engineering, especially for studying fluid dynamics and heat flows.