Abstract
Emissivity data is important for the temperature measurement using pyrometer when the sample is processed without container. A spectral emissivity measurement system combined with an electrostatic levitator was developed for high temperature melts. The radiation intensity from a high temperature sample was measured with a multichannel photo spectrometer (MCPD) over the 700 nm to 1000 nm spectral range while a Fourier Transform Infrared Spectrometer (FTIR) measured the radiation over the 1.1μm to 6μm intervals. These spectrometers were calibrated with a black body radiation furnace so that the spectral hemispherical emissivity can be calculated. The experimental results of molten zirconium and niobium are presented.
