Regensburg 2004 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 44: Poster II
HL 44.74: Poster
Donnerstag, 11. März 2004, 16:30–19:00, Poster A
Contactless determination of temperature variations in single junction thermal converters — •V. Schlosser1, G. Heine2, W. Waldmann2, M. Garcocz2, and G. Klinger3 — 1Institut für Materialphysik, Universität Wien — 2Bundesamt für Eich- und Vermessungswesen, Wien — 3Institut für Meteorologie und Geophysik, Universität Wien
The ac-dc transfer standard is one of the basic electrical standards, by which the ac voltage and ac current are deduced from their dc counterparts. A well established method is the comparison of electric power between ac- and dc- voltage by converting the power to force or heat. Converters may be recognised as reference standard and the system is called the No-dqac-dc transfer standardNo-dq. Differences in the signal between ac- and dc- power generation depend on frequency and waveform. In the low frequency regime the thermal ripple dominates the error introduced by the thermal converter. The purpose of this work was to develop an experimental set up which is capable to record the time dependend temperature fluctuations caused by ac- currents. The infrared radiation which is emitted by the heated filament and bead of a thermal converter was monitored using a scanning infrared radiation imaging set up. The method will be presented and first results will be discussed.