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Diode-Laser Absorption Spectroscopy of Rubidium in Hypersonic Flows

P.C. Palma, and W.H. Beck, (2001) Diode-Laser Absorption Spectroscopy of Rubidium in Hypersonic Flows. DLR-Interner Bericht. DLR-IB 223-01 A13, 86 S.

Full text not available from this repository.

Abstract

This report describes the development of a tunable diode laser system for performing absorption spectroscopy on a high-enthalpy shock tunnel. A prototype probe was built and placed in the shock tunnel to sample only a small section of the nozzle flow and thus make localised absorption measurements. Rudidium atoms were seeded into the flow and a diode laser operating at 780nm scanned across the Rb absorption line repetitively at 20kHz. Tests were performed with air and nitrogen test gases. The air tests proved unseccessful because Rb atoms were not remaining in the freestream in large enough quantities until the flow had developed. Instead, strong signals were obtained from the boundary layers formed on the model. This phenomena can be explained by the process of oxidation of the Rb atoms and this explanation is supported by the good results obtained from the nitrogen runs. Velocities were obtained throughout the nozzle start-up process and the velocities obtained during the test windw agree with CFD calculations.

Item URL in elib:https://elib.dlr.de/12338/
Document Type:Monograph (DLR-Interner Bericht)
Additional Information: LIDO-Berichtsjahr=2001,
Title:Diode-Laser Absorption Spectroscopy of Rubidium in Hypersonic Flows
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
P.C. Palma, UNSPECIFIEDUNSPECIFIED
W.H. Beck, UNSPECIFIEDUNSPECIFIED
Date:2001
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:86
Status:Published
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W RP - Raumtransport
DLR - Research area:Space
DLR - Program:W RP - Raumtransport
DLR - Research theme (Project):L - no assignment (old)
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology
Deposited By: Oppermann, Frau Bärbel
Deposited On:31 Jan 2006
Last Modified:14 Jan 2010 18:50

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