schlieren


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schlieren

[′shlir·ən]
(optics)
In atmospheric optics, parcels or strata of air having densities sufficiently different from that of their surroundings so that they may be discerned by means of refraction anomalies in transmitted light.
(petrology)
Irregular streaks with shaded borders in some igneous rocks, representing the segregation of light and dark minerals or altered inclusions, elongated by flow.
References in periodicals archive ?
A., "Schlieren measurements in the round cylinder of an optically accessible internal combustion engine," Applied Optics, 52(14): 3433-3443, 2013, doi:10.1364/AO.52.003433.
The subsequent flame penetration is similar to typical spray penetration results obtained from Schlieren images (see e.g., [9]).
A multichannel oscillography is utilized to synchronize both data acquisition system and Schlieren system within the useful shock tunnel test time.
Var of GASPS schlieren imaging of Supersonic shockwaves
(2000) measured [S.sub.u] for R-717 (N[H.sub.3])/air using a400 L (14.1 [ft.sup.3]) combustion vessel and schlieren visualization technique.
To the objects whose properties are by the schlieren system visualized belong transparent polymeric foils (Castle et al., 1994).
The use of the Schlieren method is based on the idea that the refractive index varies with the density of air caused by temperature variation.
SMOKE AND MIRRORS A simple optical effect underlies both shadowgraphy and schlieren imaging: Light rays bend, or refract, at the boundaries between air masses of different densities.
As described in my September 2000 article ("Understanding Thermal Behavior in Newtonian Reflectors," page 125), the schlieren test (a close cousin to the more familiar Foucault knife-edge test used by mirror makers) permits us to directly observe what is going on, and it reveals a persistent thermal chaos around the primary mirror with effects that are more damaging and long-lasting than most telescope users realize.
Biotite in the A-type Graniteville Granite was locally concentrated during aplite formation, resulting in schlieren. The intrinsically low [H.sub.2]O, FeO, and MgO contents of A-type granites inhibit early crystallization of biotite.
It is principally along secondary shrinkage fissures within the microdolerite and pegmatite lenses (schlieren of Joplin, 1964) that the wide range of minerals found at Prospect crystallized from residual hydrothermal fluids during the final stages of cooling.
Spray-wall impingement with non-vaporizing spray characterization was carried out in a high pressure-temperature constant-volume combustion vessel, through a simultaneous implementation of the Mie scattering technique for the liquid spray and the schlieren for the liquid and vapor zone.