The Visible Radiation from Helium in a Strong Shock Wave Page: 18
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time during which a clean reflected wave persisted; Thus gross devia-
tions from a constant radiation state would be observable if a tine-
resolved spectrum could be nude with a resolving tine of about 1 psec.
The experiments which gave time-integrated and tiir.e-resclved
spectra were conducted differently and they will be treated separately
here, although many of the data will be contained in a later chapter.
Figure 5 ahov-8 schematically the arrangement of apparatus for the
tine-integrated spectre. The croas-hatched region represents the walls
of a reinforced concrete building which housed the smear camera, oscil-
loscope, electronic control circuit.?, and the operators. The smear
camera recorded the shape and velocity of the shock wave. The spectrum
was obi*rved from an oblique angle so that the flat end of the tube
could be used as a window without exposing the spectrographic plate to
light from the entire length of the tube. Shortly before the reflected
wave collided with the mixing zone, the Primacord shutter was detonated
in order to stop the further pa' lage of light to the spectrograph. It
had been shown experimentally that the light emitted by the primary wave
In the region seen by the spectrograph was not detectable on a spectro-
gram; thus, proper operation of the shutter guaranteed that only the
light f-om the reflected shock wave would be recorded.
The parabolic mirror formed an image of the end of the shock
tube on both the spectrograph slit and the cathode of the photomulti-
plier tube. The plane mirror used to reflect a sample of light to the
photomultiplier was small enough so that its presence did not appreci-
ably reduce the intensity at the spectrogroph.
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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/m1/25/?rotate=270: accessed July 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.