1996 Volume 80 Issue 11 Pages 819-826
An investigatioll of time-depelldellt simulation model for the high pressures odiuln arc based upoll an energy balance equation has been carried out First, at the initial time poillt arc temperature distribution was calculated by using the lamp currellt at that point. Next, using this initial arc temperature distribution, the arc temperature profile change with time was calculated by the time-dependent energy balance equation. Within ten cycles converged arc temperature distributions in one cycle could be obtained. In pulsed operation the arc center temperature increased compared with direct current operation having same lamp currellt as the peak pulse current. As a result, in pulsed operation Na D-lines emission decreased and Na non-resonance line emissions increased compared with sine wave operation. Continuum radiation near 450nm was treated as NaHg molecular spectrum takillg into account its temperature dependellt absorption coefficient. Using this method, calculated increase rates of contilluum radiation near 450nm in pulsed operation were coincident with measured values-Taking account of these effects calculated result of correlated color temperature increases in pulsed operation was obtained.
