Development of dim light ultraviolet star simulator
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摘要:为了解决月基紫外深空观测相机地面定标的难题,研制了一种动态范围大、星等模拟精度高的紫外星模拟器。 该模拟器采用5 m离轴光管作为准直光学系统,用双积分球系统作为均匀光源,可模拟3~16等星的弱目标,其星等最小分辨率为0.2等星,星等不确定度为5.48％。通过试验证明,该星模拟器完全满足月基紫外弱光星等深空观测相机地面定标的试验要求,不仅可以在实验室内标定紫外观测相机的探测能力和灵敏度,还可用于测试观测相机的其它参数指标,为发展深空高轨探测相机提供了地面定标基础。Abstract:In order to resolve the problem on calibration for a lunar-based ultraviolet camera in deep space, an ultraviolet star simulator with large dynamic ranges and high precision simulating magnitudes was developed. By taking an off-axis collimator with the focal length of 5 000 mm as a collimating system and a double integrating sphere as the uniform source of light, it can simulate the star magnitude from 3 to 16 with the system minimum resolution of star magnitude of 0.2 and the uncertainty of 5.48%. The experimental result shows that the star simulator satisfies the requirement of ground-based calibration for the lunar-based ultraviolet camera in deep space. It not only can calibrate the detection ability and sensitivity of the ultraviolet camera, but also can measure its other technological parameters, which provides the foundation of ground-based calibration for developing the high altitude orbit camera in deep space.
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Key words:
- ultraviolet star simulator/
- star magnitude/
- collimator/
- irradiance
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