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Picosecond Electric Field CARS; A Diagnostic Technique to Measure the Electric Field Development within Nanosecond Repetitively Pulsed Plasmas

Goldberg, Benjamin M.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1354303147

Abstract Details

2012, Master of Science, Ohio State University, Mechanical Engineering.
In this thesis, a novel technique is presented to take measurements of an electric field which develops and changes rapidly in time. The motivation arises for such field measurements from the developing field of plasma assisted combustion (PAC) where nanosecond pulsed plasmas are used to increase the efficiency of the combustion process. Optically based noninvasive field measurements, while not trivially performed, are useful diagnostic tools to experimentally determine how the electric field varies in both space and time. The technique presented here is a four wave mixing technique which works similarly to coherent anti-Stokes Raman scattering (CARS) and is thus called E-Field CARS for short. Mixing collinear pump and Stokes beams with an external electric field will result in radiation emitted at the Q(1) frequency of the molecules interrogated, the H2 molecule for the body of work presented here. The IR radiation scales by the square of the electric field which leads to large signal to noise ratios (~1000) in the presence of a strong external electric field. The use a picoseconds laser system in theory would give information about the field development with sub-nanosecond precision. However, the laser itself produces an inherent source of variation in accuracy of the timing measurements. Thus, while the overall high voltage pulse shape can be accurately resolved in both field strength and overall pulse duration, each individual data point collected is accurately known to within ~10 nanoseconds, or the inherent jitter within the laser.
Walter R. Lempert, PhD (Advisor)
Igor Adamovich, PhD (Committee Member)
79 p.
Mechanical Engineering
Plasma Diagnostic Technique

Recommended Citations

Citations

  • Goldberg, B. M. (2012). Picosecond Electric Field CARS; A Diagnostic Technique to Measure the Electric Field Development within Nanosecond Repetitively Pulsed Plasmas [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1354303147

    APA Style (7th edition)

  • Goldberg, Benjamin. Picosecond Electric Field CARS; A Diagnostic Technique to Measure the Electric Field Development within Nanosecond Repetitively Pulsed Plasmas. 2012. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1354303147.

    MLA Style (8th edition)

  • Goldberg, Benjamin. "Picosecond Electric Field CARS; A Diagnostic Technique to Measure the Electric Field Development within Nanosecond Repetitively Pulsed Plasmas." Master's thesis, Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1354303147

    Chicago Manual of Style (17th edition)

osu1354303147
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© 2012, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.