Spontaneous Raman scattering was applied for quantitative temperature measurements in turbulent methanol spray flames. Possible interferences from laser-induced breakdown and elastic light scattered from the fuel drops were discriminated against by optoacoustic means. Polycyclic aromatic hydrocarbons were found to be a negligible source of fluorescence interference. The capability of measuring the probability-density function of temperature in a turbulent nonsooting spray flame with an accuracy of ±75 K was demonstrated. The technique appears simpler and less expensive than other spectroscopic approaches.
© 1996 Optical Society of America
A. N. Karpetis and A. Gomez, "Temperature measurements in spray flames by spontaneous Raman scattering," Opt. Lett. 21, 704-706 (1996)