We have made simultaneous temperature measurements by degenerate four-wave mixing (DFWM) And absorption spectroscopy of OH in a CH4–air, lifted-diffusion flame. After we corrected the DFWM data for laser beam absorption of as much as 60%, the DFWM-based temperatures were in good agreement with temperatures derived strictly from the absorption data, as well as a one-dimensional reacting flow simulation.
© 1996 Optical Society of America
Original Manuscript: July 5, 1995
Revised Manuscript: September 10, 1996
Published: November 20, 1996
G. C. Herring, William L. Roberts, Michael S. Brown, and Peter A. DeBarber, "Temperature measurement by degenerate four-wave mixing with strong absorption of the excitation beams," Appl. Opt. 35, 6544-6547 (1996)