基于积分球反射计的红外光谱发射率测量系统校正方法

Correction Method for Infrared Spectral Emissivity Measurement System Based on Integrating Sphere Reflectometer

针对非理想参考反射标准对光谱发射率测量结果的影响,基于积分球反射计的红外发射率测量系统原理,提出了一种适用于反射法光谱发射率测量系统的校正方法。通过参考反射标准样光谱反射率的数据拟合,得到反射率的曲线方程,计算反射测量系统的校正系数,校正参考标准样的输出电压,推导出光谱反射率为1的参考标准样输出电压曲线,消除了非理想参考标准造成的系统误差。应用该修正方法对基于积分球反射计的太阳能选择吸收涂层光谱发射率测量系统进行了校正,将校正后的光谱发射率测量结果与能量比较法的测量结果进行对比,验证了校正方法的可行性,有效性,提高了光谱发射率测量的准确度。

In view of the influence of non-ideal reference standard on spectral emissivity measurement,by analyzing the principle of infrared emissivity measurement system based on integrating sphere reflectometer,a calibration method suitable for measuring spectral emissivity system using the reflection measurement was proposed.By fitting a spectral reflectance curve of the reference standard sample to the given reflectance data,the correction coefficient of measurement system was computed.Then the output voltage curve of reference standard sample was corrected by this coefficient.The system error caused by the imperfection of reference standard was eliminated.The correction method was applied to the spectral emissivity measurement system based on integrating sphere reflectometer.The results measured by the corrected system and the results measured by energy comparison measurement were compared to verify the feasibility and effectivity of this correction method in improving the accuracy of spectral emissivity measurement.