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Search for Spectral Gaps in HEG

Beck, W.H. and Wollenhaupt, M. (1995) Search for Spectral Gaps in HEG. DLR-Interner Bericht. 223-95 A 44, 17 S.

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Abstract

Spontaneous emission from the shock heated gas (luminosity) in the high enthalpy shock tunnel at condition I (nominally 50 MPa burst pressure with specific enthalpy 21 MJ/kg) has been examined spectrally in order to search for spectral windows where LIF measurements could be corried out. Comparison with NO fluorescence spectra showed, that the fluorescence radiation following D(0)<--X(1)excitation only partially overlaps the lower wavelength regions of the intensity distribution of the luminosity. Two strategies to reduce the influence of this spontaneous emission have been developed: (1) for 1d-spatial resolution, spectral filtering using a spectrometer is appropriate: (2) for planar LIF-imaging narrowband reflection filters had to be developed. In spite of these filtering methods the (P)LIF method has still constraints imposed by the powerful radiation behind strong shocks.

Document Type:Monograph (DLR-Interner Bericht)
Additional Information: LIDO-Berichtsjahr=1995,
Title:Search for Spectral Gaps in HEG
Authors:
AuthorsInstitution or Email of Authors
Beck, W.H.UNSPECIFIED
Wollenhaupt, M.UNSPECIFIED
Date:1995
Journal or Publication Title:Auftragsbericht, ESA Contract 11076/94/F/WE, MSTP Phase 2, Report No. HT-TR-E34-303-DLRG
Number of Pages:17
Status:Published
Keywords:Laser induced fluorescence LIF; Nitric oxide (NO); emission spectra; High enthalpy; Shock tunnel HEG
HGF - Research field:UNSPECIFIED
HGF - Program:Space (old)
HGF - Program Themes:W RP - Raumtransport
DLR - Research area:UNSPECIFIED
DLR - Program:W RP - Raumtransport
DLR - Research theme (Project):UNSPECIFIED
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Strömungsmechanik > Institut für Experimentelle Strömungsmechanik
Deposited By: elib DLR-Beauftragter
Deposited On:03 Apr 2006
Last Modified:27 Apr 2009 10:08

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