Thermometry of an open spatially inhomogeneous flame by diode laser absorption spectroscopy

Features of a single-beam variant of diode laser absorption spectroscopy (DLAS) used for temperature measurements in a spatially inhomogeneous hot zone are studied. A flame temperature of a commercial burner is measured by using water molecule absorption lines. The flame is probed by a diode laser r...

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Bibliographic Details
Published inQuantum electronics (Woodbury, N.Y.) Vol. 48; no. 11; pp. 1055 - 1061
Main Authors Liger, V.V., Mironenko, V.R., Kuritsyn, Yu.A., Bolshov, M.A.
Format Journal Article
LanguageEnglish
Published Bristol Kvantovaya Elektronika, Turpion Ltd and IOP Publishing 01.12.2018
IOP Publishing
Subjects
ABSORPTION SPECTROSCOPY
BEAMS
CARS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Coherent scattering
COMBUSTION PROPERTIES
diode laser
Flame temperature
Inhomogeneity
Laser beams
LASER RADIATION
LASER SPECTROSCOPY
LASERS
MOLECULES
SCATTERING
Semiconductor lasers
SPECTRA
Spectrum analysis
Temperature
TEMPERATURE GRADIENTS
TEMPERATURE MEASUREMENT
Thermometry
VISIBLE RADIATION
Water chemistry
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Summary:Features of a single-beam variant of diode laser absorption spectroscopy (DLAS) used for temperature measurements in a spatially inhomogeneous hot zone are studied. A flame temperature of a commercial burner is measured by using water molecule absorption lines. The flame is probed by a diode laser radiation at various heights and in various directions. The correctness of DLAS measurement results is verified by comparing DLAS data with temperatures measured by the method of coherent anti-Stokes scattering (CARS). It is shown that in homogeneous flame domains the temperatures obtained by both the methods coincide. Temperature inhomogeneity along the probe beam direction is a principal problem of DLAS, in which case the method yields information about some effective temperature along the light trace. The difference in data obtained by DLAS and CARS is estimated. In probing traces with temperature gradients the difference reaches 700 K. Possibilities of accounting for temperature inhomogeneities along the trace in DLAS measurements are discussed. A method of differential spectra is suggested, which in certain conditions can provide substantially better coincidence of results for the two methods.
ISSN:1063-7818
1468-4799
DOI:10.1070/QEL16723