The Visible Radiation from Helium in a Strong Shock Wave Page: 22
The following text was automatically extracted from the image on this page using optical character recognition software:
was measured by observing shutter operation with the smear camera when a
bursting wire was used as a light source.
When a shot had been aligned and the' synchronizer end phantastron
had been adjusted, the slide in the spectrograph cassette was pulled and
the spectrograph!c plate was exposed to the helium reference spectrum in
regions above and below the space which vr>o to be exposed during the shot.
All preparations having been made, the shot was fired and the
resulting plate and films were developed.
An example of satisfactory records made during a shot is shown
In Fig. 6.
The arrangement of apparatus for producing time-resolved spectra
is shown In Fir.. 7. With the rotating mirror in the position shown, on
image of the shock tube slit vus formed dtt the spectrograph slit
(Section CC), and a narrow spectrum thus formed in the film plane of the
spectrograph. As the rotating mirror turned (Section BB) the position
of the spectrum moved a proportional amount down the spectrograph slit,
and changes in a stationary light source near the end of the shock tube
alit could be recorded un a spectrogram as a function of time.
Like the smear camera, the spectrograph could write for only a
small portion of each revolution of the mirror, and it was necessary to
synchronize the explosive firing tine with the j>ooitlon of the mirror.
In this case the synchronizer was adjusted so that the spectrograph
would begin "writing’ shortly before the primary chock wave reached the
end of the tube. The operating speed of the mirror was chosen so that a
spectrogram would include about 1^ ^sec, whereas the lifetime of the
Here’s what’s next.
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
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/m1/29/: accessed July 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.