SiCp/Al切削精确测温前红外热像仪发射率标定的实验研究

发射率设定对红外热像仪测量结果的准确性具有决定性的影响，必须在测温前进行准确标定。首先通过热电偶标定试验研究了发射率设定对红外热像仪测温精度的影响。其次通过析因实验分析了设定发射率的影响因素。最后通过正交实验研究了各因素对设定发射率的影响程度，并进行了经验公式拟合和实验验证。结果表明:对于SiC_p/Al复合材料，设定发射率在被测温度500 ℃前后有很大的差异，被测温度超过500 ℃时，采用推荐值作为设定方法则会产生较大误差。在0°，45°]范围内测量角度对设定发射率几乎没有影响，但温度、表面粗糙度和观测距离都会影响设定发射率。多项式拟合获得的设定发射率经验公式预测结果的最大误差为2.76%。

Experimental study on emissivity setting before precise temperature measurement of SiCp/Al cutting by infrared thermal imager

Emissivity setting has a decisive impact on the accuracy of the measurement results of infrared thermal imager, so it must be calibrated accurately before temperature measurement. In this paper, the influence of emissivity setting on temperature measurement accuracy of infrared thermal imager was studied through thermocouple calibration test. Secondly, the influence factors of emissivity setting were analyzed by factorial experiment. Finally, the influence degree of each factor on the emissivity setting was studied by orthogonal experiment, and the empirical formula fitting and experimental verification were carried out. The results show that: for SiC_p/Al composites, the emissivity setting is very different before and after the measured temperature is 500 ℃. When the measured temperature exceeds 500 ℃, using the recommended value as the setting method will produce large errors. In the range of 0°-45°, the measurement angle has no influence on the emissivity setting. However, temperature, surface roughness and observation distance all affect the emissivity setting. The maximum error of the empirical formula of the emissivity setting obtained by polynomial fitting is 2.76%.