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针对星上多点辐射定标获取方法问题,研究了变积分时间的单点绝对辐射定标方法。首先,根据红外相机响应特性建立了变积分时间的红外成像系统响应模型;其次,分析了变积分时间和变辐射亮度相机响应模型的理论差异,提出了利用星上单点标准变积分时间的红外相机绝对辐射定标方法;最后,结合探测器的光谱响应曲线,分析了变积分时间单点定标法引入的系统误差。实例计算表明:在积分时间为10 ms、温度范围为250～500 K的黑体辐射能量下,对应适当温度的单点标准变积分时间绝对定标方法,引入的最大原理误差可达1.5%。变积分时间的单点绝对定标方法避免了黑体多点定标设计和控制的复杂性,可用于空间红外相机的在轨辐射定标。
Aiming at the multi-point radiation calibration method, a single-point absolute radiation calibration method with variable integration time is studied. Firstly, the infrared imaging system response model with variable integration time is established according to the response characteristics of the infrared camera. Secondly, the theoretical differences between the variable integration time and the variable radiation brightness camera response model are analyzed. Finally, combined with the spectral response curve of the detector, the systematic errors introduced by single-point calibration with variable integration time are analyzed. The case study shows that under the blackbody radiant energy with integral time of 10 ms and temperature range of 250 ~ 500 K, the single point standard integration time absolute calibration corresponding to the proper temperature is introduced, and the maximum principle error introduced can reach 1.5%. The single-point absolute calibration method of variable integration time avoids the complexity of multi-point calibration design and control in bold and can be used for on-orbit radiation calibration of space infrared cameras.