Rayleigh scattering cross sections are measured for nine combustion species (Ar, N<sub>2</sub>, O<sub>2</sub>, CO<sub>2</sub>, CO, H<sub>2</sub>, H<sub>2</sub>O, CH<sub>4</sub>, and C<sub>3</sub>H<sub>8</sub>) at wavelengths of 266, 355, and 532 nm and at temperatures ranging from 295 to 1525 K. Experimental results show that, as laser wavelengths become shorter, polarization effects become important and the depolarization ratio of the combustion species must be accounted for in the calculation of the Rayleigh scattering cross section. Temperature effects on the scattering cross section are also measured. Only a small temperature dependence is measured for cross sections at 355 nm, resulting in a 2–8% increase in cross section at temperatures of 1500 K. This temperature dependence increases slightly for measurements at 266 nm, resulting in a 5–11% increase in cross sections at temperatures of 1450 K.
© 2004 Optical Society of America
Jeffrey A. Sutton and James F. Driscoll, "Rayleigh scattering cross sections of combustion species at 266, 355, and 532 nm for thermometry applications," Opt. Lett. 29, 2620-2622 (2004)