Measurement system for inner temperature distribution of combustion flame using infrared emission computed tomography

2002年，我们利用256像素的InGaAs红外线阵传感器研制了一套用于采集燃烧火焰热辐射投影图像的测量系统。利用该系统进行的一些基础实验表明，在甲烷-空气混合火焰的情况下，在光路长度为20 mm处的最大吸收约为10%。这说明该传感器在观测波长区(最高灵敏度，波长为2.4 nm)对水蒸气的吸收是符合我们的目的的。2003年，我们建立了一种利用黑体炉校准传感器输出的方法，提高了投影数据的精度。应用温度分布重构算法，同时获得了燃烧火焰的吸收和温度分布。重建的温度分布显示出了合理的形状。但峰值温度约为900K，远低于热电偶的测温值。分析差异的原因是未来的问题。

In 2002, we developed an measurement system for collecting a projection image of thermal radiation from a combustion flame by using InGaAs infrared linear array sensor with 256 pixels. Some fundamental experiments using this system have showed that in case of a methane-air mixed flame, the maximum absorption was about 10% at 20mm length of optical path. This shows that absorption of vapor in observation wavelength area of this sensor (maximum sensitivity, wavelength is 2.4um) is suited for our purpose.In 2003, we established a method for calibration of the sensor output by using a blackbody furnace, improved precision of projection data. We also applied the temperature distribution reconfiguration algorithm and obtained absorption and temperature distribution of combustion flame simultaneously. The reconstructed temperature distribution showed a proper result as shape. However, the peak temperature was about 900K which is quite lower than the value measured by thermocouple. Analysis of the cause of the difference is a future problem.