OH rotational temperature from two-line laser excited fluorescence
Abstract
A two-line laser excited fluorescence technique has been developed to measure the rotational temperature of the OH molecule. This technique eliminates problems encountered in the application of other laser fluorescence methods for measuring the OH temperature in combustion environments such as fluorescence trapping, non-equilibrium excited state population, spectral bandwidth sensitivity and quenching. The technique consists of exciting a specific rotational level in the A2Sigma (V1 = 0) excited state from two different rotational levels in the X2Pi (v(double prime) = 0) ground state of the OH molecule using a tunable dye laser and monitoring the broad band fluorescence. An example of the implementation of this technique in an atmospheric pressure methane-air flat flame is included. The possible application of this technique in turbulent combustion is also evaluated.
- Publication:
-
American Institute of Aeronautics and Astronautics
- Pub Date:
- July 1980
- Bibcode:
- 1980fpdy.confW....C
- Keywords:
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- Flame Temperature;
- Fluorescence;
- Hydroxyl Emission;
- Laser Spectroscopy;
- Molecular Rotation;
- Dye Lasers;
- Molecular Energy Levels;
- Molecular Excitation;
- Tunable Lasers;
- Lasers and Masers