连铸铸坯表面温度辐射测量的反问题研究

INVESTIGATION OF INVERSE PROBLEM FOR SURFACE TEMPERATURE RADIOMETRIC MEASUREMENT OF CONTINUOUS CASTING BLANK

在冶金连铸生产条件下，由于在铸坯表面和辐射高温计之间存在着辐射－吸收性介质，因此无法准确获得铸坯表面的真实温度．本文构造了此条件下的连铸测温模型，即在两不透明的无限大平板间存在一灰的水蒸气区和一非灰的水雾区．并在此基础上进行了反问题的研究，通过迭代法估计连铸坯表面的真实温度．研究了各参数对最终计算结果的影响，其中，本雾区厚度及其减弱系数影响最大，需在计算中给予足够重视；其余参数影响很小，可以忽略．

Under the production conditions of metallurgical continuous casting, the true surface temperatures of casting blanks are inaccessible because of the radiation-absorption mediums existing between the surfaCe of casting blank and the radiation thermometer. Assuming one gray Water-vapor region and one non-gray Water-fog region between two opaque infinite flat slabs, the thermometric model of continuous casting is developed to investigate inverse problem, estimating the true surface temperatures of casting blanks with an iteration procedure. The effects of various parameters on the calculation results are studied. It has been proved that the thickness and weakening coefficient of water-fog region are the key factors. Other parameters are much less influential so that they can be omitted during the calculation procedure.