Measurement of Temperature Distribution of Molten Metal Pool by UV Thermal Radiation

The accurate measurement of temperature is very important in the material processing. In measuring temperature , it is available to use the radiation thermometer that requires no physical contact with an object , but it is reported that the IR (infrared) radiation thermometer has led to noticeable error in measuring temperature of molten pool where the emissivity is variable. According to the Planck's law of radiation, it is evident that the luminance temperature (measured by radiation ther mometry) approaches the true temperature of an object, when the measuring wavelength is shorter than IR. In the present