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Medium Pressure Inductive Driven Lamps For UV- Water- Treatment

Gehring, Tim; Jin, Qihao; Kling, Rainer

Abstract (englisch):
The use of UV-radiation from mercury plasmas is a common method for water disinfection. However, because of the toxicity of the mercury, the filling amount should be lowered or the mercury should be replaced [1]. Therefore, we developed medium pressure and inductively driven plasma lamps for UV generation, in an EU founded “Horizon2020” project.

Since field effect transistors made of wide bandgap semiconductor materials like SiC and GaN are available, it is possible to build highly efficient inverters for powers ≥1 kW and frequency range up to 3 MHz [2]. Those frequencies can be used for an efficient operation of inductive plasmas [3]. Because in the inductive operation no electrodes are needed, it is possible to use lamp-filling materials, which would react in common lamps with the electrodes. The electrodeless operation opens the possibility to use a wide range of fillings to replace the mercury. Furthermore, in conventional lamps the electrodes are the most limiting factor for the lifetime of the lamps.

In our work, we tested different lamp-fillings. Due to the required vapour pressures halides are preferred here. Furthermore, with regard to the heat distribution, radiation surface and the RF power coupling, the geometry of the lamp vessels were optimized. ... mehr

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Volltext §
DOI: 10.5445/IR/1000100324
Veröffentlicht am 29.11.2019
Cover der Publikation
Zugehörige Institution(en) am KIT Lichttechnisches Institut (LTI)
Publikationstyp Vortrag
Publikationsdatum 11.11.2019
Sprache Englisch
Identifikator KITopen-ID: 1000100324
Veranstaltung 12th International Conference on Plasma Science and Applications (ICPSA 2019), Lucknow, Indien, 11.11.2019 – 14.11.2019
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