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Schlieren photography is a process for ... which can be visualised directly with a shadowgraph ... In these techniques, the background and the schlieren object (the ...
Shadowgraph is an optical method that reveals non-uniformities in transparent media like air, water, or glass. It is related to, but simpler than, the schlieren and schlieren photography methods that perform a similar function. Shadowgraph is a type of flow visualisation.
Schlieren (/ ˈ ʃ l ɪər ən / SHLEER-ən; German: [ˈʃliːʁn̩] ⓘ, German for 'streaks') are optical inhomogeneities in transparent media that are not necessarily visible to the human eye. Schlieren physics developed out of the need to produce high-quality lenses devoid of such inhomogeneities.
These are visualized by optical methods known as the shadowgraph, schlieren photography, and interferometry. More directly, dyes can be added to (usually liquid) flows to measure concentrations; typically employing the light attenuation or laser-induced fluorescence techniques. In scientific visualization flows are visualized with two main methods:
The term "schlieren imaging" is commonly used as a synonym for schlieren photography, though this article particularly treats visualization of the pressure field produced by ultrasonic transducers, generally in water or tissue-mimicking media. The method provides a two-dimensional (2D) projection image of the acoustic beam in real-time ("live ...
Shadowgraph or shadowgram, an optical method that reveals non-uniformities in transparent media Optical comparator , a device that creates silhouettes of manufactured parts for inspection Shadowgraph, an electromagnetic and optical device once used as an alternative to magic eye tube
Synthetic schlieren is a process that is used to visualize the flow of a fluid of variable refractive index. Named after the schlieren method of visualization, it consists of a digital camera or video camera pointing at the flow in question, with an illuminated target pattern behind.
This and later publications on this topic made Schardin the 20th-century patriarch of Schlieren photography and Shadowgraph imaging. From autumn 1935 to spring 1936, Schardin accompanied Cranz to China, where they established a ballistics institute in Nanking for the Chinese military.