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.