Laser-induced fluorescence of formaldehyde in combustion using third harmonic Nd:YAG laser excitation.

Abstract

Formaldehyde (CH2O) is an important intermediate species in combustion processes and it can through laser-induced fluorescence measurements be used for instantaneous flame front detection. The present study has focussed on the use of the third harmonic of a Nd:YAG laser at 355 nm as excitation wavelength for formaldehyde, and different dimethyl ether (C2H6O) flames were used as sources of formaldehyde in the experiments. The investigations included studies of the overlap between the laser profile and the absorption lines of formaldehyde, saturation effects and the potential occurrence of laser-induced photochemistry. The technique was applied for detection of formaldehyde in an internal combustion engine operated both as a spark ignition engine and as a homogenous charge compression ignition engine.

Cite this paper

@article{Brackmann2003LaserinducedFO, title={Laser-induced fluorescence of formaldehyde in combustion using third harmonic Nd:YAG laser excitation.}, author={Christian Brackmann and Jenny Nygren and Xiao Bai and Zhongshan Li and Henrik Bladh and Boman Axelsson and Ingemar Denbratt and Lucien Koopmans and Per-Erik Bengtsson and Marcus Ald{\'e}n}, journal={Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy}, year={2003}, volume={59 14}, pages={3347-56} }