Radiation power emitted from Ar torch short plasma as function of input power in several kW

Summary form only given. When reduction of waste and dissolution of iron are carried out by using an arc plasma, we need to decrease the arc radiation power, because there is the possibility of damaging the furnace wall due to the radiation. On the other hand, we can use it as a clean source for heating materials. In this case, it´s expected that radiation becomes greater. In both cases the radiation power from plasmas has to be precisely controlled. However there has been little reported on the radiation power from the torch plasma. So, we measured the radiation power from torches by using a power-meter.