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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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)|
|Title:||Search for Spectral Gaps in HEG|
|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|
|Keywords:||Laser induced fluorescence LIF; Nitric oxide (NO); emission spectra; High enthalpy; Shock tunnel HEG|
|HGF - Research field:||UNSPECIFIED|
|HGF - Program:||Space|
|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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