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为了测试风云四号气象卫星扫描成像辐射计的扫描镜的动态运动精度,设计了一种高精度动态测角仪。该测角仪利用了扫描成像辐射计的可见光通道,采用622nm的LED可见光,经过菲涅耳透镜投射到目标板上,然后充满投影光学系统的入瞳,利用光学成像分析像点位置及相互关系的方法来评价扫描镜的运动精度。介绍了该测角仪的投影光学系统、照明系统和系统总体的设计。
In order to test the dynamic motion accuracy of the scanning mirror of the FY-4 meteorological satellite scanning imaging radiometer, a high-precision dynamic goniometer was designed. The goniometer uses the visible light channel of the scanning imaging radiometer. It uses 622nm LED visible light and projects onto the target plate through the Fresnel lens. Then it fills the entrance pupil of the projection optical system and uses optical imaging to analyze the position of the pixel point and its relationship Method to evaluate the scanning mirror’s motion accuracy. The projection optical system, lighting system and overall design of the goniometer are introduced.