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Two-photon absorption laser-induced fluorescence measurement of atomic Oxygen density in an atmospheric pressure air plasma jet

Conway, Jim orcid logoORCID: 0000-0003-4282-2240, Gogna, Guru Sharan and Daniels, Stephen (2016) Two-photon absorption laser-induced fluorescence measurement of atomic Oxygen density in an atmospheric pressure air plasma jet. In: 69th Annual Gaseous Electronics conference, 10 Oct - 14 Oct 2016, Ruhr University Bocham, Germany.

Two-photon Absorption Laser Induced Fluorescence (TALIF) is used to measure atomic oxygen number density [O] in an air Atmospheric Pressure Plasma Jet (APPJ). A novel technique based on photolysis of O2 is used to calibrate the TALIF system ensuring the same species (O) is probed during calibration and measurement. As a result, laser intensity can be increased outside the TALIF quadratic laser power region without affecting calibration reliability as any high intensity saturation effects will be identical for calibration and experiment. Higher laser intensity gives stronger TALIF signals helping overcome weak TALIF signals often experienced at atmospheric pressure due to collisional quenching. O2 photo-dissociation and two-photon excitation of the resulting [O] are both achieved within the same laser pulse. The photolysis [O] is spatially non-uniform and time varying. To allow valid comparison with [O] in a plasma, spatial and temporal correction factors are required. Knowledge of the laser pulse intensity I0(t), and wavelength allows correction factors to be found using a rate equation model. The air flow into the jet was fixed and the RF power coupled into the system varied. The resulting [O] was found to increase with RF power
Item Type:Conference or Workshop Item (Poster)
Event Type:Conference
Uncontrolled Keywords:Two-photon Absorption Laser Induced Fluorescence; Atmospheric pressure jet; Atomic Oxygen number density; In-situ TALIF calibration; Molecular oxygen photolysis calibration; Rate equation model
Subjects:Physical Sciences > Plasmas
Physical Sciences > Physics
DCU Faculties and Centres:Research Institutes and Centres > National Centre for Plasma Science and Technology (NCPST)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Enterprise Ireland, Science Foundation Ireland, Grant No.08/SRC/I1411
ID Code:21523
Deposited On:14 Dec 2016 11:02 by James Conway . Last Modified 16 Aug 2022 10:00

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