Determination of HID electrode falls in a model lamp I: Pyrometric measurements

摘要: To verify models describing the near-electrode regions electrodes of pure and doped tungsten for high intensity discharge lamps are investigated in a special model lamp. It can be operated with arc currents 1 A to 10 A, DC or AC arbitrary waveforms up few kHz. Argon xenon, at pressures from 0.1 MPa MPa, used as fill gases. large variety inserted. perform spatially resolved measurements they displaced reproducibly within tube during lamp operation. Spatially pyrometric electrode surface temperature case operation presented. From distribution power loss by thermal radiation heat conduction is determined. increases almost linearly current anode less than linear cathode. relation deduced between cathode fall fed into setting balance cathodic transfer zone. The resulting falls show strong dependence on diameter. Electrical separate given subsequent paper. outcomes both methods modelling compared third