以红外辐射基本理论为基础，将红外温度测量同被测物发射率相分离，构建未涉及发射率的红外三波段测温向量组，解决红外测温结果同发射率耦合度低的问题。进一步优化三波段向量组，提出无量纲发射率模型及适宜波段条件。通过对发射率线性函数进行优化，引入弯曲指数n，拓展发射率函数的应用范围。适宜波段条件的提出则保证了三波段测温向量组结果的精确性。对四个硫化矿样本应用三波段测温法同传统红外测温法进行实验测温对比研究，分析结果表明：三波段测温法同真实温度吻合度较常规红外测量好，且相对误差明显小于传统红外测温，验证了三波段测温法的可用性及精确性。三波段测温法在保证测量精度的同时拓宽了普通单波段红外热像仪的应用范围，保证了硫化矿自燃红外预测数值精度。

Based on the basic theory of infrared radiation, infrared tri-wavelength vectors group altering low coupling between emissivity and infrared temperature measurement was derived to isolate the object emissivity and infrared temperature measurement. In order to optimize the tri-wavelength vectors group, a non-dimensional emissivity model was established and the most suitable wavelength range was identified. Aiming at optimizing the linear function of emissivity, the bending index n was introduced. The appropriate wavelength range to guarantee exactness of result of tri-wavelength vectors group was presented. The tri-wavelength measurement was demonstrated in a laboratory experiment with four sulfide ore samples. The results show that the fitting of tri-wavelength measurement with true temperature is better than that of common infrared temperature measurement. The fractional error of tri-wavelength measurement significantly is less than the common. The availability and accuracy of tri-wavelength measurement are verified. The tri-wavelength measurement ensures the measurement accuracy as well as expands the scope of common thermal infrared imager application and ensures the numerical accuracy of infrared prediction in the spontaneous combustion of sulfide ores.