In view of the application of light-extinction techniques for fuel-specie-concentration measurements in combustion systems, the vapor-absorption coefficient of several hydrocarbon species at the 3.39-μm He-Ne laser transition has been measured. The hydrocarbon species include paraffins, olefins, and aromatics. Results are included for total pressure over the range of approximately 200–650 Torr at 295 K with air as the buffer gas. Observations are made regarding the difference in the absorption coefficient within and between hydrocarbon classifications.
© 2003 Optical Society of America
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(120.4530) Instrumentation, measurement, and metrology : Optical constants
(260.3060) Physical optics : Infrared
(300.1030) Spectroscopy : Absorption
James A. Drallmeier, "Hydrocarbon absorption coefficients at the 3.39-μm He-Ne laser transition," Appl. Opt. 42, 979-982 (2003)