17 February 2017 Two-beam femtosecond rotational CARS for one-dimensional thermometry in a turbulent, sooting jet flame
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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 N2, 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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Daniel R. Richardson, Sukesh Roy, James R. Gord, Sean P. Kearney, "Two-beam femtosecond rotational CARS for one-dimensional thermometry in a turbulent, sooting jet flame", Proc. SPIE 10094, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XVII, 100941E (17 February 2017); doi: 10.1117/12.2248914; https://doi.org/10.1117/12.2248914
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