The Visible Radiation from Helium in a Strong Shock Wave Page: 28
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UlUMB Hoyai faa film, an accurate Mtiurml of thock tube transit
Un could be made If the ukw :amtr* synchroniser vert set to record*
la «M!Uw to the reflection, the Uee *t which the shock wt entered
the hell on. This, of ecuret, only fete e valve of average shock velocity,
hot it vet shown that the average velocity In a take 10' long Vas, within
iWpirluitsl error, the nm i« that In a tube JO" long. these data,
which ltd to the assumption of cons tan t shock velocity, are treated In a
later section, j
! tVo unsuccessful attempts were aarfe to measure the position of
the priAary shock wave at several points as a function of Use. The
first was s shadowgraph Method, in which a grid placed nest to the shock
tube on the side opposite the casern was illuminated by an argon flash.^
it was hoped that the shock front would be dense enough to absorb s
detectable mount of the argon light or cause a sudden curvature in the
elements of the grid ss seen through the shock wave, but neither effect
was observed, the other vein effort consisted of placing thin barriers
along the Inner surface of the shock tube, hoping to see slsute reflec-
tions which would be so snail as not to disturb the plane wave hydrody-
namics, but in this case also no disturbance was detectable with the
Measurements of the shape (intensity vs. vavelet^th) of s spec-
tral line Troo a apectrogras required that the photographic emulsion be
calibrated with respect to relative light Intensity in the spectral
1B. a. Shraffl.r and B. H. Christian, J. Appl. Phys. g£, J2k
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Seay, Glenn Emmett. The Visible Radiation from Helium in a Strong Shock Wave, report, January 1957; Los Alamos, New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc502356/m1/35/: accessed June 15, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.