Physics
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aps..gecetp461d&link_type=abstract
American Physical Society, Gaseous Electronics Conference October 5-8, 1999 Norfolk, VA, abstract #ETP4.61
Physics
Scientific paper
Optical emission spectroscopy is used to investigate the plasma characteristics of the near-electrode regions of metal halide high intensity discharge lamps (NaI, ScI3, and Hg) operated on various ballasts. Spatial resolution of 0.2 mm is obtained by magnifying the region of interest and probing the image plane with a fiber optic coupled to a spectrometer. Temporal resolution of 0.2 msec is obtained by interrupting the emission with a line-synchronized mechanical chopper. Mercury emission dominates the output from the electrode region in both the anode and cathode phases. Ratios of these lines are used to qualitatively picture the variation of the near-electrode electron temperature during an ac cycle. Emission from the metal additives versus electrical phase is significantly different from the mercury emission: during the anode phase the metal emission is nearly absent, whereas the peak of the metal emission is delayed during the cathode phase relative to that from mercury. Variations in optical emission are correlated with various types of electrode structures and with various current waveforms, suggesting how these lamp system design parameters impact plasma parameters.
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