Interpretation of the spectral structure of Rayleigh scattered light from combustion gases
Conference
·
OSTI ID:7355029
The determination of the temperature of combustion gases from Rayleigh scattered laser light can be greatly simplified if the effect of Brillouin scattering is assumed to be negligible. To define precisely the regimes in which this assumption is applicable, measurements of the broadening effect of Brillouin scattering on the R ayleigh spectra from nitrogen, oxygen, air and argon have been made with a Fabry-Perot spectrometer. These spectra were analyzed using a trimodal Gaussian model convoluted with the instrument function for the spectrometer. The results of this investigation indicate that if the value of a parameter y, the ratio of the wavelength of the fluctuations producing the scattering divided by 2..pi.. to the collision mean free path, is less than 0.1, Brillouin scattering is negligible. This criterion is shown to be satisfied in the post flame zone of an atmospheric pressure premixed hydrogen air flame.
- Research Organization:
- Sandia Labs., Albuquerque, N.Mex. (USA); California Univ., Berkeley (USA). Lawrence Berkeley Lab.; California Univ., Berkeley (USA)
- DOE Contract Number:
- AT(29-1)-789
- OSTI ID:
- 7355029
- Report Number(s):
- SAND-75-8704; CONF-760102-5
- Country of Publication:
- United States
- Language:
- English
Similar Records
Temperature and density in a hydrogen--air flame from Rayleigh scattering
Bayesian deconvolution of spectra for Rayleigh and Brillouin scattering in glasses
Laser Rayleigh thermometry in turbulent flames
Journal Article
·
Tue Nov 30 23:00:00 EST 1976
· Combust. Flame; (United States)
·
OSTI ID:7227437
Bayesian deconvolution of spectra for Rayleigh and Brillouin scattering in glasses
Journal Article
·
Thu May 01 00:00:00 EDT 1986
· J. Appl. Spectrosc. (Engl. Transl.); (United States)
·
OSTI ID:5190590
Laser Rayleigh thermometry in turbulent flames
Conference
·
Wed Dec 31 23:00:00 EST 1980
· Symp. (Int.) Combust., (Proc.); (United States)
·
OSTI ID:5451195
Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
AIR
ARGON
CHEMICAL REACTIONS
COHERENT SCATTERING
COMBUSTION
CRYOGENIC FLUIDS
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION SPECTRA
FLAMES
FLUIDS
GASES
LASERS
NITROGEN
NONMETALS
OXIDATION
OXYGEN
PRESSURE DEPENDENCE
RADIATIONS
RARE GASES
RAYLEIGH SCATTERING
SCATTERING
SPECTRA
TEMPERATURE DEPENDENCE
VARIATIONS
VISIBLE RADIATION
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
AIR
ARGON
CHEMICAL REACTIONS
COHERENT SCATTERING
COMBUSTION
CRYOGENIC FLUIDS
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION SPECTRA
FLAMES
FLUIDS
GASES
LASERS
NITROGEN
NONMETALS
OXIDATION
OXYGEN
PRESSURE DEPENDENCE
RADIATIONS
RARE GASES
RAYLEIGH SCATTERING
SCATTERING
SPECTRA
TEMPERATURE DEPENDENCE
VARIATIONS
VISIBLE RADIATION