Abstract

An alternative to the saturation approach is proposed to avoid the quenching dependence of the fluorescence intensity. The method allows direct absolute measurement of the local number density from a single laser shot. A mean quenching cross section of 5 × 10⁻¹⁹ m² is deduced from the experiments, and a OH concentration profile through the flame is given.

© 1979 Optical Society of America

Local OH concentration measurement in atmospheric pressure flames by a laser-saturated fluorescence method: two-optical path laser-induced fluorescence

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Diffracted stimulated emission induced by two strong coherent crossed laser beams for concentration measurement

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