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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, Gaman, Cezar, Turner, Miles M. orcid logoORCID: 0000-0001-9713-6198 and Daniels, Stephen (2016) Two-photon absorption laser induced fluorescence measurement of atomic oxygen density in an atmospheric pressure air plasma jet. Plasma Sources Science and Technology, 25 (4). 045023. ISSN 0963-0252

Abstract
Atomic oxygen number density [O] is measured in an air atmospheric pressure plasma jet (APPJ) using two-photon absorption laser induced fluorescence (TALIF). Gas flow is fixed at 8 slpm, the RF power coupled into the plasma jet varied between 5 W and 20 W, and the resulting changes in atomic oxygen density measured. Photolysis of molecular oxygen is employed to allow in situ calibration of the TALIF system. During calibration, O2 photodissociation and two-photon excitation of the resulting oxygen atoms are achieved within the same laser pulse. The atomic oxygen density produced by photolysis is time varying and spatially non-uniform which needs to be corrected for to calibrate the TALIF system for measurement of atomic oxygen density in plasma. Knowledge of the laser pulse intensity I0(t), wavelength, and focal spot size allows correction factors to be determined using a rate equation model. Atomic oxygen is used for calibration and measurement, so the laser intensity can be increased outside the TALIF quadratic laser power dependence region without affecting the calibration reliability as the laser power dependence will still be the same for both. The atomic O density results obtained are not directly benchmarked against other known density measurement techniques. The results show that the plasma jet atomic oxygen content increases as the RF power coupled into the plasma increases.
Metadata
Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:Two-photon Absorption Laser Induced Fluorescence, Atomic oxygen number density, Atmospheric plasma jet, In-situ calibration
Subjects:Physical Sciences > Plasmas
DCU Faculties and Centres:Research Initiatives and Centres > National Centre for Plasma Science and Technology (NCPST)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Publisher:Institute of Physics
Official URL:http://iopscience.iop.org/article/10.1088/0963-025...
Copyright Information:© 2016 IOP Publishing Ltd
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:grant no:IP/2013/0267
ID Code:21519
Deposited On:12 Dec 2016 14:36 by James Conway . Last Modified 16 Aug 2022 10:00
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