Two-Beam Femtosecond Rotational CARS for One-Dimensional Thermometry in a Turbulent, Sooting Jet Flame
Daniel R. Richardson,Sukesh Roy,James R. Gord,Sean P. Kearney +3 more
- 09 Jan 2017
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TL;DR: In this paper, single-laser-shot femtosecond rotational coherent anti-Stokes Raman scattering (RCARS) temperature measurements are performed across a 6-mm line in a turbulent, sooting ethylene jet flame to characterize temperature gradients.
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Abstract: Single-laser-shot femtosecond rotational coherent anti-Stokes Raman scattering (fs-RCARS) temperature measurements are performed across a 6-mm line in a turbulent, sooting ethylene jet flame to characterize temperature gradients. A 60- fs pulse is used to excite many rotational Raman transitions in N 2 , and a 160-ps pulse is used to probe the Raman coherence. The spatial resolution of the measurements is 500 μm in the direction of beam propagation and 50 μm in the transverse directions. Measurements have been performed at multiple locations in the jet flame, and the measured temperature are similar to previously recorded point measurements. Future work will include performing simultaneous laser-induced incandescence (LII) measurements to measure soot volume fraction to perform joint statistical analysis of the sooting turbulent flame.
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Citations
Three-beam rotational coherent anti-Stokes Raman spectroscopy thermometry in scattering environments.
TL;DR: The presence of two-beam CARS signal contamination was experimentally verified using a femtosecond-picosecond rotational CARS instrument in two scattering environments: a fireball generated by a laboratory-scale explosion that contained particulate matter, metal fragments, and soot, and a flow of air and small liquid droplets.
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Combustion Temperature Measurement Using Spontaneous Raman Spectroscopy Asymmetric Voigt Function Fitting
Huili Dou,Yunming Zhao,Zhanfeng Wang,Song Yang,Chunyu Li,Liu Yu,Peng Cheng +6 more
References
Laser Diagnostics for Temperature and Species in Unsteady Combustion
A. C. Eckbreth
- 01 Jan 1996
TL;DR: In this article, a review of the state of the art in spatially and temporally precise laser diagnostics for temperature and species is presented, including two-dimensional implementations, their state of maturity assessed, and major remaining research issues identified.
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Recent advances in coherent anti-Stokes Raman scattering spectroscopy: Fundamental developments and applications in reacting flows
TL;DR: In this article, the authors provide an overview of recent progress in ns-, ps-, and fs-CARS spectroscopy for gas-phase thermometry and species-concentration measurements since the second edition of A.C. Eckbreth's book entitled Laser Diagnostics for Combustion Temperature and Species.
470
Single-shot gas-phase thermometry using pure-rotational hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering
TL;DR: The hybrid fs/ps RCARS approach can be performed with kHz-rate laser sources while avoiding corrections that can be difficult to predict in unsteady flows, and allows for uncorrected best-fit N2-RCARS temperature measurements with ~1% accuracy.
109
Communication: Two-dimensional gas-phase coherent anti-Stokes Raman spectroscopy (2D-CARS): Simultaneous planar imaging and multiplex spectroscopy in a single laser shot
TL;DR: This work introduces a technique for single-shot two-dimensional (2D) spatial measurements of gas phase CARS spectra by combining new phase matching and detection schemes with the high efficiency of femtosecond excitation of Raman coherences.
105
Time- and frequency-dependent model of time-resolved coherent anti-Stokes Raman scattering (CARS) with a picosecond-duration probe pulse.
Hans U. Stauffer,Joseph D. Miller,Mikhail N. Slipchenko,Terrence R. Meyer,Benjamin D. Prince,Sukesh Roy,James R. Gord +6 more
TL;DR: It is demonstrated, via comparison with vibrational CARS results on a time-evolving solvated organic chromophore, that this top-hat probe-pulse configuration can provide improved spectral resolution, although the degree of improvement depends on the dephasing timescales of the observed molecular modes and the duration and timing of the narrowband final pulse.
103