Open AccessAnalysis of C2 Swan Bands in Ablation-Dominated Arcs in CO2 Atmosphere
Author(s) -
Ralf Methling,
Steffen Franke,
Nicolas Götte,
Sebastian Wetzeler,
Dirk Uhrlandt
Publication year - 2019
Publication title -
plasma physics and technology
Language(s) - English
Resource type - Journals
eISSN - 2336-2634
pISSN - 2336-2626
DOI - 10.14311/ppt.2019.1.82
Subject(s) - optics , nozzle , materials science , spectrometer , absorption spectroscopy , absorption (acoustics) , spectroscopy , tungsten , atmosphere (unit) , emission spectrum , analytical chemistry (journal) , physics , spectral line , chemistry , quantum mechanics , metallurgy , thermodynamics , chromatography , astronomy
A model circuit breaker in a high-pressure chamber filled with CO 2 atmosphere is used to operate a wall-stabilized arc of several kilo-amperes between tungsten-copper electrodes surrounded by polytetrafluoroethylene nozzles. Optical emission spectroscopy (OES) is carried out via quartz plates inserted into the nozzles using a combination of an imaging spectrometer either with a high-speed video camera or with an ICCD camera. Depending on the nozzle geometry and the current, continuum from C 2 Swan bands was detected as absorption as well as emission pattern. After current zero, optical absorption spectroscopy (OAS) using a xenon flashlamp as broadband background radiator was applied. An absorption around 493 nm was detected and attributed to CuF molecules. The study proofs the existence of C 2 in the active phase and the formation of CuF near to current zero.