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A schlieren photograph showing the compression in front of an unswept wing at Mach 1.2 Schlieren image of a shotshell projectile exiting a barrel Schlieren photography is a process for photographing fluid flow.
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.
Sagnac interferometer; Schlieren interferometer (phase-shifting) Shearing interferometer (lateral and radial) Twyman–Green interferometer; Talbot–Lau interferometer; Watson interferometer (microscopy) White-light interferometer (see also Optical coherence tomography, White light interferometry, and Coherence Scanning Interferometry)
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 ...
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 Mach–Zehnder interferometer is a device used to determine the relative phase shift variations between two collimated beams derived by splitting light from a single source. The interferometer has been used, among other things, to measure phase shifts between the two beams caused by a sample or a change in length of one of the paths.
Pages for logged out editors learn more. Contributions; Talk; Schlieren interferometer
Interferometry is a technique which uses the interference of superimposed waves to extract information. [1] Interferometry typically uses electromagnetic waves and is ...