Normal spectral emissivity measurement of liquid iron and nickel using electromagnetic levitation in direct current magnetic field

Normal spectral emissivities of liquid iron and nickel were measured for wavelengths of 780 to 920 nm by direct measurement of normal spectral radiance using electromagnetic levitation in a direct current (DC) magnetic field. A DC magnetic field suppressed surface oscillation and the transitional motion of the liquid metal droplets. The normal spectral emissivities of both liquid iron and nickel show weak negative wavelength dependence and have negligible temperature dependence. The normal spectral emissivities of liquid iron and nickel at 807 nm were determined respectively as 0.394 ± 0.012 (1600 K to 1950 K (1327 °C to 1677 °C)) and 0.368 ± 0.004 (1720 K to 1825 K (1447 °C to 1552 °C)). The experimental uncertainty used here is double the value of the standard deviation.