Fluorescence measurements of atomic hydrogen radicals in active environments ignited at atmospheric pressure
| Authors | |
|---|---|
| Year of publication | 2016 |
| Type | Article in Proceedings |
| Conference | 23rd Europhysics Conference on Atomic and Molecular Physics of Ionized Gases - proceedings |
| MU Faculty or unit | |
| Citation | |
| Field | Plasma physics |
| Keywords | TALIF; plasma; fluorescence; hydrogen; DBD |
| Description | Spatial maps of concentration of atomic hydrogen radicals in coplanar surface dielectric barrier discharge (DBD), volume DBD and a flame atomizer in Ar – H 2 (– O 2 ) mixtures were measured by two-photon absorption laser-induced fluorescence (TALIF) and modeled by a gas flow and plasma chemistry simulation. Problematic points of TALIF measurement at atmospheric pressure were analyzed, including laser-surface interactions and fast quenching of excited species. A high atomic hydrogen concentration was found in the coplanar surface DBD, which is in agreement with the high power density in the thin discharge channel. It was shown that the dielectric surface serves as a source or reservoir of hydrogen radicals. Whereas in both DBDs addition of oxygen led to a fast decrease of atomic hydrogen concentration, some optimum flow of oxygen for production of atomic hydrogen in the flame atomizer was found. |
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