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Determination of Relative Number Densities and Quenching Rates of Sodium in an Atmospheric Flame by Asynchronous Optical Sampling

Published online by Cambridge University Press:  22 February 2011

Gregory J. Fiechtner ,
Yanan Jiang ,
Galen B. King ,
Normand M. Laurendeau  and
Fred E. Lytle
Gregory J. Fiechtner
Affiliation:
Flame Diagnostics Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907
Yanan Jiang
Affiliation:
Visiting Professor, Tshinghua University, Beijing, China
Galen B. King
Affiliation:
Flame Diagnostics Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907
Normand M. Laurendeau
Affiliation:
Flame Diagnostics Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907
Fred E. Lytle
Affiliation:
Department of Chemistry, Purdue University, West Lafayette, IN 47907
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Extract

Pump/probe methods are commonly employed to measure subnanosecond excited state processes in liquid and gas phase systems. Asynchronous Optical Sampling (ASOPS) is a newly-developed pump/probe method that will potentially allow the determination of number densities and relaxation rates in turbulent, high-pressure flames. In addition, ASOPS should yield a better signal-to-noise ratio than laser-induced fluorescence in practical combustion environments. The ASOPS method utilizes a coherent, signal-carrying beam and thus requires no more optical access than LDV measurements. The current ASOPS instrument consists of two dye lasers synchronously pumped by two frequency-doubled, mode-locked Nd:YAG lasers. The two lasers operate at slightly different repetition rates, causing a relative phase walk-out between the pump and probe beams. This strategy allows the mapping of subnanosecond excitation processes in a time scale on the order of milliseconds.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 117: Symposium C – Process Diagnostics: Materials, Combustion, Fusion , 1988 , 187
Copyright
Copyright © Materials Research Society 1988

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