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In Situ Time-Resolved Laser Diagnostics for Plasma Methane Reforming.

Record Type:	Electronic resources : Monograph/item
Title/Author:	In Situ Time-Resolved Laser Diagnostics for Plasma Methane Reforming./
Author:	Chen, Timothy Y.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Description:	143 p.
Notes:	Source: Dissertations Abstracts International, Volume: 83-04, Section: B.
Contained By:	Dissertations Abstracts International83-04B.
Subject:	Mechanical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28652140
ISBN:	9798471107366

In Situ Time-Resolved Laser Diagnostics for Plasma Methane Reforming.
Chen, Timothy Y.

In Situ Time-Resolved Laser Diagnostics for Plasma Methane Reforming. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 143 p.

Source: Dissertations Abstracts International, Volume: 83-04, Section: B.

Thesis (Ph.D.)--Princeton University, 2021.

This item must not be sold to any third party vendors.

There is significant interest in utilizing plasmas for reforming methane, a powerful greenhouse gas into larger hydrocarbons and useful chemicals using non-equilibrium plasmas powered by renewable electricity. However, the key reaction pathways and the plasma dynamics are not well understood due to lack of time-resolved in situ measurements in the literature for model validation. This demands the application and development of advanced laser diagnostics to provide critical experimental data for creating a quantitative understanding of the physics and chemistry of plasma CH4 reforming. In this dissertation, several different time-resolved laser diagnostics including Thomson scattering, electric field induced second harmonic generation (E-FISH), and spatially-resolved one-dimensional (1-D) hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering (fs/ps CARS) imaging of rotation-vibration non-equilibrium were developed and applied to identify the key physics and chemistry of CH4-containing pulsed plasmas. First, a sensitive Thomson/Raman scattering diagnostic was built to measure the time evolution of the electron properties in a CH4/He volumetrically uniform nanosecond-pulsed dielectric barrier discharge (ns-DBD) as well as vibrational temperature in a CH4/N2/He ns-DBD. The Thomson scattering instrument was able to measure electron temperatures of 0.5 eV and electron densities as low as 1x10.

ISBN: 9798471107366Subjects--Topical Terms:

649730
Mechanical engineering.
Subjects--Index Terms:

Coherent anti-Stokes Raman scattering

In Situ Time-Resolved Laser Diagnostics for Plasma Methane Reforming.
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245 1 0 $a In Situ Time-Resolved Laser Diagnostics for Plasma Methane Reforming.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2021
300 $a 143 p.
500 $a Source: Dissertations Abstracts International, Volume: 83-04, Section: B.
500 $a Advisor: Kolemen, Egemen;Ju, Yiguang.
502 $a Thesis (Ph.D.)--Princeton University, 2021.
506 $a This item must not be sold to any third party vendors.
520 $a There is significant interest in utilizing plasmas for reforming methane, a powerful greenhouse gas into larger hydrocarbons and useful chemicals using non-equilibrium plasmas powered by renewable electricity. However, the key reaction pathways and the plasma dynamics are not well understood due to lack of time-resolved in situ measurements in the literature for model validation. This demands the application and development of advanced laser diagnostics to provide critical experimental data for creating a quantitative understanding of the physics and chemistry of plasma CH4 reforming. In this dissertation, several different time-resolved laser diagnostics including Thomson scattering, electric field induced second harmonic generation (E-FISH), and spatially-resolved one-dimensional (1-D) hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering (fs/ps CARS) imaging of rotation-vibration non-equilibrium were developed and applied to identify the key physics and chemistry of CH4-containing pulsed plasmas. First, a sensitive Thomson/Raman scattering diagnostic was built to measure the time evolution of the electron properties in a CH4/He volumetrically uniform nanosecond-pulsed dielectric barrier discharge (ns-DBD) as well as vibrational temperature in a CH4/N2/He ns-DBD. The Thomson scattering instrument was able to measure electron temperatures of 0.5 eV and electron densities as low as 1x10.
520 $a 12 cm.
520 $a (-3) Second, time-resolved multi-species laser absorption measurements were conducted to study the chemistry of plasma CH4/CO2 reforming. Both experimental species and electron properties data were used to develop and validate a 1-D plasma kinetic model of plasma CH4/CO2 reforming. Next, the plasma dynamics in the ns-DBD was studied through time-resolved electric field and electron properties measurements using E-FISH and Thomson scattering. Lastly, new fs/ps CARS diagnostics were developed for spatially resolved 1-D imaging of rotation-vibration non-equilibrium as well as 1-D thermometry using CH4 as the probe molecule. Time-domain fs/ps CARS modelling of the CH4 ν1 Q-branch enabled quantitative temperature measurements using CH4. Time and spatially-resolved fs/ps CARS measurements near the cathode of a CH4/N2 pin to pin discharge showed localized regions of high CH4 conversion and N2 vibrational temperature. Both of these fs/ps CARS diagnostics demonstrate significant potential in characterization of non-equilibrium molecular energy transfer near reacting gas-surface interfaces.
590 $a School code: 0181.
650 4 $a Mechanical engineering. $3 649730
650 4 $a Optics. $3 517925
650 4 $a Plasma physics. $3 3175417
653 $a Coherent anti-Stokes Raman scattering
653 $a Laser diagnostics
653 $a Methane reforming
653 $a Non-equilibrium plasma
653 $a Plasma chemistry
653 $a Thomson scattering
690 $a 0548
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710 2 $a Princeton University. $b Mechanical and Aerospace Engineering. $3 2102828
773 0 $t Dissertations Abstracts International $g 83-04B.
790 $a 0181
791 $a Ph.D.
792 $a 2021
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28652140