Abstract

A simultaneous optimization method is proposed for absorption spectroscopy postprocessing. This method is particularly useful for thermometry measurements based on congested spectra, as commonly encountered in combustion applications of ${\mathrm{H}}_2\mathrm{O}$ absorption spectroscopy. A comparison test demonstrated that the simultaneous optimization method had greater accuracy, greater precision, and was more user-independent than the common step-wise postprocessing method previously used by the authors. The simultaneous optimization method was also used to process experimental data from an environmental chamber and a constant volume combustion chamber, producing results with errors on the order of only 1%.

© 2015 Optical Society of America

Measurements of multiple gas parameters in a pulsed-detonation combustor using time-division-multiplexed Fourier-domain mode-locked lasers

Andrew W. Caswell, Sukesh Roy, Xinliang An, Scott T. Sanders, Frederick R. Schauer, and James R. Gord
Appl. Opt. 52(12) 2893-2904 (2013)

Single-ended mid-infrared laser-absorption sensor for simultaneous in situ measurements of H₂O, CO₂, CO, and temperature in combustion flows

Wen Yu Peng, Christopher S. Goldenstein, R. Mitchell Spearrin, Jay B. Jeffries, and Ronald K. Hanson
Appl. Opt. 55(33) 9347-9359 (2016)

Demonstration of temperature imaging by H₂O absorption spectroscopy using compressed sensing tomography

Xinliang An, Mack S. Brittelle, Pascal T. Lauzier, James R. Gord, Sukesh Roy, Guang-Hong Chen, and Scott T. Sanders
Appl. Opt. 54(31) 9190-9199 (2015)

Quantum cascade laser absorption sensor for carbon monoxide in high-pressure gases using wavelength modulation spectroscopy

R. M. Spearrin, C. S. Goldenstein, J. B. Jeffries, and R. K. Hanson
Appl. Opt. 53(9) 1938-1946 (2014)

Multispecies absorption spectroscopy of detonation events at 100 kHz using a fiber-coupled, time-division-multiplexed quantum-cascade-laser system

Keith D. Rein, Sukesh Roy, Scott T. Sanders, Andrew W. Caswell, Frederick R. Schauer, and James R. Gord
Appl. Opt. 55(23) 6256-6262 (2016)