TY - GEN
T1 - Time and frequency-domain FS/PS cars measurements and modelling of the ch4 V1 vibrational q-branch
AU - Chen, Timothy Y.
AU - Goldberg, Benjamin M.
AU - Kolemen, Egemen
AU - Ju, Yiguang
AU - Kliewer, Christopher J.
N1 - Funding Information:
This material is based upon work supported by the U.S. Department of Energy (DOE), Office of Science, Office of Workforce Development for Teachers and Scientists, Office of Science Graduate Student Research (SCGSR) program. The SCGSR program is administered by the Oak Ridge Institute for Science and Education (ORISE) for the DOE. CJK and BMG were supported by the Office of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, U.S. Department of Energy. Sandia National Laboratories is a multi-mission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy's National Nuclear Security Administration. YJ would like to thank the funding support of DOE Plasma Science Center, NETL UCFER, and National Science Foundation grants. TYC was partially supported by the Program in Plasma Science and Technology Fellowship (PPST). TYC, EK, and YJ acknowledge the support of ExxonMobil through its membership in the Princeton Eaffiliates Partnership of the Andlinger Center for Energy and the Environment. The simulations presented in this article were performed on computational resources managed and supported by the Princeton Institute for Computational Science and Engineering and the Office of Information Technology at Princeton University. We thank Brian D. Patterson for his technical assistance in setting up the furnace experiments.
Publisher Copyright:
© 2021, American Institute of Aeronautics and Astronautics Inc, AIAA. All Rights Reserved.
PY - 2021
Y1 - 2021
N2 - With the increased interest in CH4 as a fuel for power generation, propulsion, and catalytic reforming, spatially and timeresolved quantitative measurements of CH4 are increasingly needed to advance these technologies. Hybrid fs/ps coherent anti-Stokes Raman scattering (fs/ps CARS) has been demonstrated to measure temperature and chemical species concentrations with tens of microns of spatial resolution on the picosecond time scale. However, accurate time-domain and frequency-domain models are necessary to understand the effect of probe delay on the fs/ps CARS signal. In this work, a time-domain model was developed for the CH4 11 vibrational Q-branch validated by delay scans across pressures ranging from 70 Torr to 600 Torr and furnace setpoint temperatures up to 1000 K. A simple modified exponential energy gap (MEG) law was implemented to fit to the room temperature delay scans to approximate the Q-branch linewidths. It was also found that changing the collisional partner did not influence the time-domain decay of the CH4 Q-branch signal prior to 100 picosecond probe delays. Comparison between simultaneously measured N2 Q-branch and CH4Qbranch spectra showed good agreement with evaluated temperatures.
AB - With the increased interest in CH4 as a fuel for power generation, propulsion, and catalytic reforming, spatially and timeresolved quantitative measurements of CH4 are increasingly needed to advance these technologies. Hybrid fs/ps coherent anti-Stokes Raman scattering (fs/ps CARS) has been demonstrated to measure temperature and chemical species concentrations with tens of microns of spatial resolution on the picosecond time scale. However, accurate time-domain and frequency-domain models are necessary to understand the effect of probe delay on the fs/ps CARS signal. In this work, a time-domain model was developed for the CH4 11 vibrational Q-branch validated by delay scans across pressures ranging from 70 Torr to 600 Torr and furnace setpoint temperatures up to 1000 K. A simple modified exponential energy gap (MEG) law was implemented to fit to the room temperature delay scans to approximate the Q-branch linewidths. It was also found that changing the collisional partner did not influence the time-domain decay of the CH4 Q-branch signal prior to 100 picosecond probe delays. Comparison between simultaneously measured N2 Q-branch and CH4Qbranch spectra showed good agreement with evaluated temperatures.
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U2 - 10.2514/6.2021-1143
DO - 10.2514/6.2021-1143
M3 - Conference contribution
AN - SCOPUS:85100301267
SN - 9781624106095
T3 - AIAA Scitech 2021 Forum
SP - 1
EP - 10
BT - AIAA Scitech 2021 Forum
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
T2 - AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021
Y2 - 11 January 2021 through 15 January 2021
ER -