Accurate measurement method and instrument for surface temperature of steel billets traceable to international temperature scales
Surface temperature of steel billets is an important parameter in steel production.The re-sults are required accurate and can be traced to international temperature scales.However,the results are always inaccurate and untraceable.Firstly,an accurate method for surface temperature measure-ment based on changing radiation was proposed.The intrinsic radiation and multiple reflected radia-tion are obtained by converting the position of the tube.Using the dual-wavelength method to simulta-neously measure surface temperature and emissivity,and the influence of uncertain emissivity is elim-inated.A pyrometer is developed.For the issue of results that cannot be traced back to the interna-tional temperature scale,the contradictory conditions in calibration and measurement is analyzed.A method for constructing an ideal plane is proposed.The blackbody and thermal equilibrium conditions on the measured plane is met,so that the results can be traced to laboratory standards.Building a traceability platform and conduct experimental verification.Experimental results show that the average error of the pyrometer is 2.36℃at 600-1 000 ℃,and the standard uncertainty is 0.75 ℃.
surface temperature measurementtraceabilityemissivityideal planechanging radiation
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