Local OH concentration measurement in atmospheric pressure flames by a laser-saturated fluorescence method: two-optical path laser-induced fluorescence
Abstract
Measurements of the number density of OH in flames at atmospheric pressure by TOPLIF are reported. TOPLIF (two-optical-path laser-induced fluorescence) improves the accuracy of LIF measurements by taking into account both the spatial profile of the exciting laser intensity and the collisional transfer rate. The model is based on simultaneously recording the LIF signals from focal volumes of two different shapes. The ratio of the signals is a measure of the saturation parameter (which depends on the laser intensity and the quenching) using which accurate determination of the species number density can be deduced from the fluorescence signals. The method is valid as far as at least partial saturation is reached.
- Publication:
-
Applied Optics
- Pub Date:
- January 1991
- DOI:
- 10.1364/AO.30.000090
- Bibcode:
- 1991ApOpt..30...90D
- Keywords:
-
- Atmospheric Pressure;
- Density Measurement;
- Flame Propagation;
- Flame Spectroscopy;
- Hydroxyl Radicals;
- Laser Induced Fluorescence;
- Calibrating;
- Optical Paths;
- Turbulent Flow;
- Instrumentation and Photography;
- FLUORESCENCE: LASER-INDUCED;
- FLAMES