基于亮度温度模型的多光谱真温反演算法研究

Multispectra Iltrue temperature inversion algorithm based1on brightness temperature model

针对传统的非接触式真温反演算法存在反演速度慢和精度低等问题,提出新的基于亮度温度模型的约束真温反演算法(constrained true temperature inversion algorithm, CTTIA)。在建模过程中,发现发射率和亮度温度存在内在联系:由亮度温度到发射率的普适规律和由发射率到亮度温度的普适规律。通过仿真实验发现当发射率的样本数量巨大时,CTTIA不但可以为实验提供理论指导,还可大大提升发射率样本的选取效率。在1 800℃和2 000℃两个温度点下建立9个波长通道对被测目标进行测量计算。结果表明,CTTIA与二次测量算法(second measurement method, SMM)相比,精度基本相同,反演时间最高节约了82%。说明该方法的研究是非常关键且重要的,是很有研究价值的。

Aim at traditional contactless true temperature inversion algorithm has the problems of slow inversion speed and low accuracy,a new constrained true temperature inversion algorithm(CTTIA)based on luminance temperature model is proposed.In the whole modeling process,it is found that emissivity and luminance temperature have internal relations:the universal law from luminance temperature to emissivity or from emissivity to luminance temperature.The simulation results show that when the number of emissivity samples is huge,the CTTIA can not only provide theoretical guidance for the experiment,but also greatly improve the selection efficiency of emissivity samples.Nine wavelength channels are built to measure and calculate the measured objectives at 1800℃and 2000℃.The results show that the accuracy of the CTTIA is almost the same as that of the second measurement method(SMM),and the inversion time is reduced to 82%.It illustrates that the research of this method is very critical and important,has great research value.