Quenching-independent measurement of species concentrations in flames by laser-induced fluorescence

Technical Report · Sat Sep 01 04:00:00 EDT 1990

DOI:https://doi.org/10.2172/6764345· OSTI ID:6764345

Salmon, J T; Carter, C D; Laurendeau, N M

This report describes work accomplished in the last two years on measurement of species concentrations in flames via laser-induced fluorescence. During this period, we have published absolute number densities of atomic hydrogen in subatmospheric, premixed C{sub 2}H{sub 4}/O{sub 2}/Ar flames at equivalence ratios of 1.0 and 1.7 via two-photon excited fluorescence. This work has led to the development of a new single-laser, two-step fluorescence method for the detection of atomic hydrogen in flames. Using photoionization controlled-loss spectroscopy (PICLS), we have verified the T{sup {minus}1/2} dependence of quenching on temperature for atomic hydrogen, in agreement with kinetic theory. Previous work on pyrometry using laser-saturated fluorescence (LSF) and the anomalous fluorescence from pyrene has evolved into publication of a major review paper on temperature measurements by light-scattering methods. Finally, we have demonstrated the feasibility of quantitative LSF measurements of NO concentration by obtaining relative saturation curves and NO fluorescence profiles. 25 refs.

• Research Organization: Purdue Univ., Lafayette, IN (USA). Flame Diagnostics Lab.
• Sponsoring Organization: DOE/ER
• DOE Contract Number: FG02-88ER13866
• OSTI ID: 6764345
• Report Number(s): DOE/ER/13866-1; ON: DE91000795
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
440600 -- Optical Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
AROMATICS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CONDENSED AROMATICS
DECOMPOSITION
DOCUMENT TYPES
ELEMENTS
FLAME PHOTOMETRY
FLAMES
FLUORESCENCE
HYDROCARBONS
HYDROGEN
IONIZATION
LASERS
LUMINESCENCE
MEASURING METHODS
NEODYMIUM LASERS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
NONMETALS
OPTICAL SYSTEMS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOIONIZATION
PHOTOMETRY
PROGRESS REPORT
PYRENE
PYROLYSIS
SOLID STATE LASERS
SPECTROSCOPY
THERMOCHEMICAL PROCESSES