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
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.