Detection and imaging of nitrogen dioxide with the degenerate four-wave-mixing and laser-induced-fluorescence techniques.

The spectroscopic techniques of degenerate four-wave mixing (DFWM) and laser-induced fluorescence (LIP) have been applied to the detection of minor species for combustion diagnostics. We compare the results obtained when these techniques are used to detect NO(2). Previous results show that DFWM signals increase for NO(2) when buffer gas is added and that LIP signals are greatly reduced under the same circumstances. We make direct quantitative comparisons of these two techniques and discuss their suitability for making measurements of NO(2) in combustion environments.

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