红外目标模拟器校准系统的研制与应用

采用标准辐射和红外目标模拟器的辐射交替折转进入红外光谱辐射计的方法，研制的红外目标模拟器校准系统可以对红外目标模拟器进行直接校准．该系统由标准准直辐射源，光束偏转装置和红外光谱辐射计组成．标准准直辐射源由工作温度为50℃～1050℃的标准黑体和口径300mm的离轴抛物面作主镜的准直光管组成．光束偏转装置由口径465mm的反射镜和定位精度5″的转台组成．红外光谱辐射计采用圆形渐变滤光片CVF对入射的辐射分光，3个光谱工作区间为1μm～3μm，3μm～5μm和8μm～14μm。3个区间的测试数据显示了最小可校准的光谱辐照度低于10^-11／cm^2，系统的相对标准不确定度为2％．

DEVELOPMENT AND APPLICATION OF INFRARED TARGET SIMULATOR CALIBRATION SYSTEM

By using the method of deflecting the standard radiation and the IRTS (IR Target Simulator) radiation into IR spectroradiometer alternatively, the developed IRTSCS(IR Target Simulator Calibration System) can calibrate IRTS directly. IRTSCS is consists of a standard collimating unit, a radiation-deflecting device and an IR spectroradiometer. The standard collimating unit contains a standard blackbody working in temperature of 50℃～1050℃ and a collimator which main mirror is an off-axis paraboloid of aperture 300mm. The radiation-deflecting device is composed of a 465mm aperture of reflecting mirror and a rotating platform with locating precision of 5″. IR spectroradiometer adopts CVF (Circular Variable Filter) to disperse the incident radiation. It has three working spectral in the ranges of 1μm～3μm, 3μm～5μm and 8μm～14μm respectively. Testing datum of the three ranges show that the minimum spectral irradiance of calibration is lower than 10 -11W/cm2. The relative standard uncertainty of IRTSCS is 2% .