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VUV shock layer radiation in an arc-jet wind tunnel experimentMeasurements were made of the radiating gas cap of a blunt body in a NASA-Ames 20 MW arc-jet wind tunnel. The test gas was air. Spectra of the flux incident on a small aperture centered at the stagnation region were obtained. A helium-cooled, magnesium fluoride window transmitted the flux into an evacuated collimating system that focused the aperture onto the entrance slit of a spectrometer. Data were obtained with films and by photomultipliers. The spectral ranges covered were the vacuum ultraviolet, VUV, (120 nm to 200 nm) and the ultraviolet to near infrared (200 nm to 900 nm) with resolutions from 0.05 nm to 0.5 nm. This paper presents the preliminary VUV results from the experiment. Results from the 200 nm to 900 nm spectral range have been presented elsewhere. Representative spectral records from 120 nm to 200 nm are shown. The intense atomic oxygen and nitrogen lines which are of concern to hypersonic flight are measured. Carbon lines are are also seen. These results will be used to help develop and validate aerothermodynamic computational models of arc-jet wind tunnel performance and help to assess the importance of VUV heating to entering spacecraft.
Document ID
Document Type
Craig, Roger A.
(MCAT Inst. Moffett Field, CA., United States)
Palumbo, Giuseppe
(Eloret Corp. Santa Clara, CA., United States)
Carrasco, Armando
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 6, 2013
Publication Date
July 1, 1994
Publication Information
Publication: MCAT Inst., Planetary Entry Experiments
Subject Category
Accession Number
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.
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