Wavelength-dependence of refractive index function of soot particle by two-color laser-induced incandescence

International Bunsen Discussion Meeting and Workshop Laser-induced incandescence: Quantitative Interpretation, Modelling, Application

Y. Bouvier ; E. Therssen ; P. Desgroux

Others  :  http://CEUR-WS.org/Vol-195/bouvier.pdf
PID  :  2848

来源: CEUR

【 摘 要 】

A new method is proposed to obtain the variation of the refractive index function of soot particles E(m) with wavelength. The method consists to select laser energies at different wavelengths ensuring the equality of the LII signals in the low fluence regime. Such equality is consistent with the fact that the soot particle has reached the same temperature independent on the laser wavelength, e.g. the soot particle has absorbed the same energy. The measurement of the laser energies insuring a perfect concordance of the LII intensities allows the determination of the corresponding variation of E(m) with wavelength. The method is applied in a methane diffusion flame by using laser radiation at 532 and 1064 nm. [first paragragh]