Abstract

Diode-laser-based sum-frequency generation of ultraviolet (UV) radiation at 313.5 nm was utilized for high-speed absorption measurements of OH mole fraction and temperature at rates up to 20 kHz. Sensor performance was characterized over a wide range of operating conditions in a 25.4 mm path-length, steady, C₂H₄–air diffusion flame through comparisons with coherent anti-Stokes Raman spectroscopy (CARS), planar laser-induced fluorescence (PLIF), and a two-dimensional numerical simulation with detailed chemical kinetics. Experimental uncertainties of 5% and 11% were achieved for measured temperatures and OH mole fractions, respectively, with standard deviations of <3% at 20 kHz and an OH detection limit of <1 part per million in a 1 m path length. After validation in a steady flame, high-speed diode-laser-based measurements of OH mole fraction and temperature were demonstrated for the first time in the unsteady exhaust of a liquid-fueled, swirl-stabilized combustor. Typical agreement of ~5% was achieved with CARS temperature measurements at various fuel/air ratios, and sensor precision was sufficient to capture oscillations of temperature and OH mole fraction for potential use with multiparameter control strategies in combustors of practical interest.

© 2005 Optical Society of America

Diode-laser-based ultraviolet-absorption sensor for high-speed detection of the hydroxyl radical

Thomas N. Anderson, Robert P. Lucht, Terrence R. Meyer, Sukesh Roy, and James R. Gord
Opt. Lett. 30(11) 1321-1323 (2005)

Phase-locked two-line OH planar laser-induced fluorescence thermometry in a pulsating gas turbine model combustor at atmospheric pressure

Robert Giezendanner-Thoben, Ulrich Meier, Wolfgang Meier, Johannes Heinze, and Manfred Aigner
Appl. Opt. 44(31) 6565-6577 (2005)

In situ measurements of nitric oxide in coal-combustion exhaust using a sensor based on a widely tunable external-cavity GaN diode laser

Thomas N. Anderson, Robert P. Lucht, Soyuz Priyadarsan, Kalyan Annamalai, and Jerald A. Caton
Appl. Opt. 46(19) 3946-3957 (2007)

Simultaneous planar laser-induced incandescence, OH planar laser-induced fluorescence, and droplet Mie scattering in swirl-stabilized spray flames

Terrence R. Meyer, Sukesh Roy, Vincent M. Belovich, Edwin Corporan, and James R. Gord
Appl. Opt. 44(3) 445-454 (2005)

OH planar laser-induced fluorescence measurements with high spatio-temporal resolution for the study of auto-ignition

Christoph M. Arndt, Robert Schießl, and Wolfgang Meier
Appl. Opt. 58(10) C14-C22 (2019)