变积分时间的空间红外相机单点绝对辐射定标法

Single-point absolute radiometric calibration for space infrared camera by changing integration time

  • 摘要: 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耀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。

     

    Abstract: Amethodofin-orbitradiometriccalibrationbychangingintegrationtimeforspaceinfrared camerawasproposedaimingtomultiple-pointradiometriccalibrationobtainingmethod.Firstly,the responsemodelbychangingintegrationtimewasdevelopedaccordingtoresponsecharacteristicsofspace infraredcamera.Secondly,theoreticaldifferencesbetweenchangingintegrationtimeandradiancewere analyzed.Themethodofradiometriccalibrationbychangingintegrationtimeusingasingle-pointstandard wasproposedforin-orbitapplication.Finally,theerrorintroducedbythismethodwasanalyzed combiningthenonlinearityofdetector.Theexamplecalculationshowsthatthemaximumprincipleerror ofthismethodis1.5%underpropertemperatureatthesameradiantenergywhentemperatureis250to 500Kandintegrationtimeis10ms.Single-pointabsoluteradiometriccalibrationbychangingintegration timecanavoidthecomplexityofdesignandcontrolofmultiple-pointradiometriccalibrationsystem,and canbeusedforin-orbitradiometriccalibration.

     

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