多波長レーザ光源を用いた火炎内多環芳香族炭化水素の励起発光マトリクス(EEM)の測定(熱工学,内燃機関,動力など)

概要

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Measurements of Excitation-Emission Matrix (EEM) of polycyclic aromatic hydrocarbons (PAHs) in an atomospheric diffusion burner flame were conducted using a multi-wavelength excitation laser in order to demonstrate the potential of the EEM fluorometry for investigation of soot formation processes in flames. The PAHs in the flame were excited by a coherent multi-wavelength "rainbow" laser light generated by converting the 3rd harmonic (355nm) of a pulsed Nd: YAG laser using a Raman cell frequency converter filled with hydrogen (0.6MPa). The LIF from the PAHs in the flame was captured using a spectrometer and an ICCD camera as EEM images. The LIF due to 2- to 3-rings PAHs was observed around 300 to 400nm when excited at 275nm in the upstream region in the flame and the intensity of the LIF decreased in the downstream. The LIF due to 3- to 6-rings PAHs was observed at the emission wavelength of longer than 400nm at all excitation wavelengths employed in the present study between 275 and 417nm and the intensity of the LIF increased in the downstream region in the flame. It was shown that the scattered excitation laser light from soot particles on the EEM images, which severely interfered with the LIF, can effectively be reduced by applying a delay between the laser excitation and the ICCD gating.
一般社団法人日本機械学会の論文
2004-02-25