Coherent Rayleigh-Brillouin scattering as a flow diagnostic technique

Journal Article · Tue Dec 09 00:00:00 EST 2014 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4902615· OSTI ID:22390564

Graul, J. S.; Lilly, T. C. ^[1]

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1. Department of Mechanical and Aerospace Engineering, University of Colorado Colorado Springs, 1420 Austin Bluffs Parkway, Colorado Springs, CO 80918 (United States)

Broadband coherent Rayleigh-Brillouin scattering (CRBS) was used to measure translational gas temperatures for nitrogen at the ambient pressure of 0.8 atm using a purpose-built Fabry-Perot etalon spectrometer. Temperatures derived from the CRBS spectral analysis were compared with experimentally-measured temperatures, and were found to be, on average, within 2% of the experimentally-measured value. Axial flow velocities from a double jet at a pressure ratio of 0.38 were also measured by looking at the Doppler shift of the CRBS line shape. With recent developments in chirped laser technology and the capacity of CRBS to simultaneously provide thermodynamic and bulk flow information, the CRBS line shape acquisition and analysis technique presented here may allow for future time-resolved, characterization of aerospace flows.

• OSTI ID: 22390564
• Journal Information: AIP Conference Proceedings, Vol. 1628, Issue 1; Conference: 29. International Symposium on Rarefied Gas Dynamics, Xi'an (China), 13-18 Jul 2014; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BRILLOUIN EFFECT
CAPACITY
COMPARATIVE EVALUATIONS
DIAGNOSTIC TECHNIQUES
DOPPLER EFFECT
FABRY-PEROT INTERFEROMETER
GAS FLOW
NITROGEN
RAYLEIGH SCATTERING
TEMPERATURE MEASUREMENT
THERMODYNAMICS
TIME RESOLUTION
VELOCITY