Abstract
The problem of emissivity change on metal surface complicates the radiation thermometry measurement of weld pools. Therefore, in the conventional radiation thermometry, an emissivity correction has been one of the most important subjects. The objective of the present investigation is to develop an ultraviolet (UV) radiation thermometry, which is tolerance to an emissivity change. Because, according to the Planck's law of radiation, it is evident that the effect of temperature on the spectral radiance is greater at the shorter wavelength, and radiation thermometry in UV range is expected to reduce the error caused by this emissivity change. Generally, the radiation energy in UV range is lower than that in IR range at the same temperature. A measurement system that is sensitive to the UV radiation has been developed in the present work. The system consists of an image intensifier, and multiple optical band-pass filters.
