Abstract

Width-increased dual-pump enhanced coherent anti-Stokes Raman spectroscopy (WIDECARS) measurements were used to determine the temperature and major species mole fractions in laminar, premixed, ethylene–air flames operating at atmospheric pressure. Conventional ultrabroadband dye lasers for WIDECARS, which use Pyrromethene dyes, have historically suffered from day-to-day wavelength shifting. To overcome this problem, a new ultrabroadband dye laser was developed in this study to provide a stable wavelength and power generation. A new dye laser pumping scheme and a mixture of Sulforhodamine 640, Kiton Red 620, and Rhodamine 640, was used to generate the desired FWHM ${\sim}{15}\;{\rm nm}$ (${410}\;{{\rm cm}^{ - 1}}$) bandwidth. The WIDECARS measured mole fraction ratios of ${{\rm CO}_2}$, CO, and ${{\rm H}_2}$ with ${{\rm N}_2}$ agreed well with chemical equilibrium calculations.

© 2020 Optical Society of America

Width-increased dual-pump enhanced coherent anti-Stokes Raman spectroscopy

Sarah A. Tedder, Jeffrey L. Wheeler, Andrew D. Cutler, and Paul M. Danehy
Appl. Opt. 49(8) 1305-1313 (2010)

Characteristics of a broadband dye laser using Pyrromethene and Rhodamine dyes

Sarah A. Tedder, Jeffrey L. Wheeler, and Paul M. Danehy
Appl. Opt. 50(6) 901-914 (2011)

Coherent anti-Stokes Raman spectroscopy measurement of ethylene in combustion

Andrew D. Cutler, Emanuela C. A. Gallo, and Luca M. L. Cantu
Appl. Opt. 56(11) E30-E36 (2017)

Concentration and pressure scaling of CH₂O electronic-resonance-enhanced coherent anti-Stokes Raman scattering signals

Daniel K. Lauriola, K. Arafat Rahman, Hans U. Stauffer, Mikhail N. Slipchenko, Terrence R. Meyer, and Sukesh Roy
Appl. Opt. 60(4) 1051-1058 (2021)

Simultaneous temperature and sensitive two-species concentration measurements by single-shot CARS

Michel Pealat, P. Magre, P. Bouchardy, and G. Collin
Appl. Opt. 30(10) 1263-1273 (1991)