Cavity ring down spectroscopy and laser-induced fluorescence for NO2 detection

Angela Staicu; R. Evertsen; N. J. Dam; J. J. ter Meulen

doi:10.1117/12.432900

29 June 2001 Cavity ring down spectroscopy and laser-induced fluorescence for NO₂ detection

Angela Staicu, R. Evertsen, N. J. Dam, J. J. ter Meulen

Proceedings Volume 4430, ROMOPTO 2000: Sixth Conference on Optics; (2001) https://doi.org/10.1117/12.432900
Event: ROMOPTO 2000: Sixth Conference on Optics, 2000, Bucharest, Romania

Abstract

The spectroscopic detection of NO₂ has been investigated in the visible spectral range by laser induced fluorescence (LIF) and cavity ring down spectroscopy (CRDS). NO₂ mixtures with air or argon at different pressures have been studied with LIF by excitation at 532 nm and detection in the range 550-580 nm. Collisional quenching and vibrational energy transfer appear to limit the application of LIF to sub-atmospheric pressures. Therefore, flow samples of NO₂ in dry air at atmospheric pressure in the concentration range of 0.1 ppm to 15 ppm have been studied by CRDS. The absorption cross section of NO₂ in the range between 437 nm and 450 nm has been determined and compared to literature. The sensitivity of the CRDS system was estimated to be 50 ppb. The effect of elevated temperatures on the absorption coefficient was examined for temperatures of 377 K and 433 K.

Citation Download Citation

Angela Staicu, R. Evertsen, N. J. Dam, and J. J. ter Meulen "Cavity ring down spectroscopy and laser-induced fluorescence for NO₂ detection", Proc. SPIE 4430, ROMOPTO 2000: Sixth Conference on Optics, (29 June 2001); https://doi.org/10.1117/12.432900

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