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Measurement of radical-species concentrations and polycyclic aromatic hydrocarbons in flames by fluorescence and absorption using a tunable dye laser. Progress report, March 1, 1981-February 28, 1982

Technical Report ·
OSTI ID:5224878
; ; ;
A laser saturated fluorescence technique which can be used to measure accurate OH radical concentrations over wide ranges of flame pressure, composition and temperature has been demonstrated. The balanced cross-rate model is used to analyze the fluorescence data. OH number densities calculated from saturated fluorescence agree to within 20% with number densities calculated from independent absorption measurements. In addition, the ratio of number densities calculated from saturated fluorescence and absorption is constant over an order of magnitude range of flame pressure, demonstrating the insensitivity of the saturated fluorescence signal to collisional transfer rates. A two line saturated fluorescence temperature measurement technique has been developed and demonstrated. The flame temperatures measured by the technique exhibit low scatter and show good agreement with OH absorption and corrected thermocouple measurements. The effect of the multi-axial mode structure of the dye laser on saturation of OH resonances has been investigated both theoretically, using a quantum mechanical density matrix analysis, and experimentally, by measuring the OH saturation parameter for two different transitions over a wide range of flame pressure. Preliminary single pulse laser saturated fluorescence measurements have been demonstrated for OH in 350 torr flat flames. Initial PAH fluorescence measurements of naphthalene and anthracene have been performed in a vapor cell. The results suggest that these two species can be distinguished by their characteristic excitation or fluorescence spectra.
Research Organization:
Purdue Univ., Lafayette, IN (USA). School of Mechanical Engineering
DOE Contract Number:
AS02-78ER04939
OSTI ID:
5224878
Report Number(s):
DOE/ER/04939-4; COO-4939-4; ON: DE82012324
Country of Publication:
United States
Language:
English

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Measurement of radical species concentrations and polycyclic aromatic hydrocarbons in flames by fluorescence and absorption using a tunable dye laser. Progress report, March 1, 1982-February 28, 1983. [NH radicals]
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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400104 -- Spectral Procedures-- (-1987)
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ANTHRACENE
AROMATICS
CONDENSED AROMATICS
DATA
DISPERSIONS
DYE LASERS
ELECTROMAGNETIC RADIATION
EMISSION SPECTROSCOPY
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
EXPERIMENTAL DATA
FLAMES
FLUORESCENCE
FLUORESCENCE SPECTROSCOPY
HYDROCARBONS
HYDROXYL RADICALS
INFORMATION
LASER RADIATION
LASERS
LIQUID LASERS
LOW PRESSURE
LUMINESCENCE
MIXTURES
NAPHTHALENE
NUMERICAL DATA
ORGANIC COMPOUNDS
POLYCYCLIC AROMATIC HYDROCARBONS
RADIATIONS
RADICALS
RESEARCH PROGRAMS
ROTATIONAL STATES
SPECTROSCOPY
TEMPERATURE MEASUREMENT
TIME DEPENDENCE