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Endoscopic filtered Rayleigh scattering for the analysis of ducted gas flows

Doll, Ulrich and Stockhausen, Guido and Willert, Christian (2014) Endoscopic filtered Rayleigh scattering for the analysis of ducted gas flows. Experiments in Fluids, 55 (3), pp. 1-13. Springer. DOI: 10.1007/s00348-014-1690-z ISSN 0723-4864

Full text not available from this repository.

Official URL: http://dx.doi.org/10.1007/s00348-014-1690-z

Abstract

Laser-induced Rayleigh scattering makes use of the fact that elastically scattered laser light from Atoms or molecules hold information on pressure, temperature and velocity inside the observed region of interest. Being several orders of magnitude weaker than other elastic light scattering effects such as Mie scattering from larger particles or laser flare from surfaces, the accuracy of Rayleigh scattering measurements strongly depends on the attenuation of these unwanted but omnipresent noise effects. The image-based technique of filtered Rayleigh scattering makes use of the absorption bands of atomic or molecular gases to remove strong elastic scattering effects from the measured signal. The concept is extended by frequency tuning a narrow line-width continuous wave laser light source along the absorption filter’s transmission profile. In acquiring images at several known frequencies, this results in spectra for each camera pixel from which time-averaged temperature, pressure and velocity fields can be deduced simultaneously. In order to qualify the frequency scanning filtered Rayleigh scattering technique for applications with strongly limited accessibility, it is applied to characterize the flow inside a bell-mouthed circular duct. The Image data are acquired endoscopically via a fiberscope that is placed downstream from the measurement plane.

Item URL in elib:https://elib.dlr.de/88342/
Document Type:Article
Title:Endoscopic filtered Rayleigh scattering for the analysis of ducted gas flows
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Doll, Ulrichulrich.doll (at) dlr.deUNSPECIFIED
Stockhausen, Guidoguido.stockhausen (at) dlr.deUNSPECIFIED
Willert, Christianchris.willert (at) dlr.deUNSPECIFIED
Date:February 2014
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:55
DOI :10.1007/s00348-014-1690-z
Page Range:pp. 1-13
Editors:
EditorsEmail
Tropea, C.UNSPECIFIED
Westerweel, J.UNSPECIFIED
Publisher:Springer
ISSN:0723-4864
Status:Published
Keywords:Rayleigh scattering, molecular filter, endoscope , image fiber bundle , frequency scanning, flow diagnostics, multi-parameter , simultaneous
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation Methods (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Doll, Ulrich
Deposited On:04 Mar 2014 09:52
Last Modified:06 Sep 2019 15:25

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