Emission and holographic interferometry measurements in a superorbital expansion tube

McIntyre, TJ, Bishop, AI, Thomas, AM, Wegener, MJ and Rubinsztein-Dunlop, H (1998) Emission and holographic interferometry measurements in a superorbital expansion tube. Aiaa Journal, 36 6: 1049-1054. doi:10.2514/2.478


Author McIntyre, TJ
Bishop, AI
Thomas, AM
Wegener, MJ
Rubinsztein-Dunlop, H
Title Emission and holographic interferometry measurements in a superorbital expansion tube
Journal name Aiaa Journal   Check publisher's open access policy
ISSN 0001-1452
Publication date 1998-01-01
Sub-type Article (original research)
DOI 10.2514/2.478
Volume 36
Issue 6
Start page 1049
End page 1054
Total pages 6
Language eng
Abstract Free-piston-driven expansion tubes are capable of generating flaw conditions over a wide range of enthalpies ranging from orbital up to superorbital velocities. Initial optical measurements aimed at investigating the flow in such a facility are presented. Emission studies were used to identify impurities in the how and to investigate spectral regions that are accessible by optical techniques. At moderate enthalpies, it was found that significant radiation resulted from metallic contaminants. At high enthalpies, the spectrum consisted of a number of atomic lines together with a broadband background component indicative of the presence of electrons. The presence of this radiation may limit the applicability of optical techniques that require spectral regions free from the influence of atomic transitions or background radiation. Emission spectroscopy (through Stark broadened hydrogen lines) and two-wavelength holographic interferometry were used to measure the electron number density behind a bow shock on a blunt body at conditions where significant ionization was observed. They yielded average concentrations of (3 +/- 1) x 10(17) cm(-3) from the emission measurements and (3.8 +/- 0.6) x 10(17) cm(-3) from the interferometry.
Keyword Engineering, Aerospace
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Physical Sciences Publications
 
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Created: Mon, 13 Aug 2007, 20:28:54 EST