对转炉炼钢过程中炉口火焰温度的非接触式在线测量进行了研究。采用无需假设发射率模型的基于最小二乘法的多光谱测温法，利用海洋光学的微型光谱仪USB4000 作为分光器件，构建了相应的炉口火焰辐射信息采集系统。采用与炉口火焰温度相近的炉内铁水作为辐射源对系统进行标定，获得其响应系数。选取不同波段的光谱数据,分别将改进的标定方式以及利用卤钨灯进行标定的方式应用于倒炉铁水温度的测量，测温结果表明，波长区间为600~740 nm 时，采用改进的方式取得的结果最优。将该方法应用于冶炼过程中炉口火焰温度的在线测量,得到炉口火焰温度在整个吹炼过程中的变化趋势。结果表明，采用所提出的测温方法不仅可以在线反映转炉操作对炉口火焰温度的影响，同时也为炉口操作工人判断炉内铁水的温度提供了有效的依据。

The non- contact online temperature measurement of the flame at the converter mouth during the basic oxygen steelmaking process is investigated. Multi- spectral radiation thermometry based on the least squares method in which no emissivity model is needed is adopted for the flame temperature measurement. A flame radiation signal collection system at the converter mouth is constructed by taking the Ocean Optics miniature spectrometer USB4000 as the beam split element. The responsivity of the proposed system is obtained by adopting the radiation of the liquid steel in the converter whose temperature is close to that of the flame at the converter mouth for the system calibration. Temperature of the liquid steel during tapping is measured using spectral data of different wavelength bands with responsivity obtained by the improved calibration method and the halogen lamp method, respectively. The results show that the improved calibration method can achieve the best performance in the wavelength band of 600~740 nm. The online flame temperature measurement at the converter mouth is carried out with the proposed method, and the variation in the flame temperature during the steelmaking process is obtained. The results show that the proposed method can not only indicate the impact of the converter operation on the flame temperature at the converter mouth, but also offer a useful auxiliary way for the operators to control the temperature of the liquid steel in the converter.