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针对目前光学口径不断增大的空间光学遥感器实验室辐射定标的需求,基于近距离扩展源照明方法设计了400~900 nm谱段内最大积分辐射亮度为200 W/(m2·sr)的4 m直径均匀扩展定标光源。该定标光源内径为4 000 mm,出光面直径为1 600 mm。对该定标光源光机结构进行了详细设计,利用光纤光谱仪监视输出的相对光谱分布,CPLD结合单片机实现输出光谱辐亮度值无人值守智能化远程自动控制。使用PR 735光谱辐射计测量该光源400~900 nm谱段内最大积分辐射亮度为222.62 W/(m2·sr),通过对定标光源的稳定性、面均匀性及角度均匀性测试,分析了定标光源的测量不确定度为3.57%。实验结果表明:该定标光源可以满足口径1 600 mm以下可见/近红外空间光学载荷的实验室辐射定标需要,并可实现智能程控化控制,提高了定标测试精度。
In order to meet the demand of radiation calibration of space optical remote sensor laboratory with increasing optical caliber, the maximum integral radiation brightness of 400 ~ 900 nm spectrum band is designed to be 200 W / (m2 · sr) based on the extended source illumination method 4 m diameter expansion of the standard calibration light source. The calibrated light source has an inner diameter of 4,000 mm and a light-emitting surface diameter of 1,600 mm. The calibration light source light machine structure was designed in detail, the use of fiber optic spectroscopy to monitor the relative output spectral distribution, CPLD combined with SCM to achieve the output spectral radiance unattended intelligent remote automatic control. Using the PR 735 spectroradiometer, the maximum integral radiance of the light source in the range of 400-900 nm was measured to be 222.62 W / (m2 · sr). The stability, surface uniformity and angular uniformity of the calibrated light source were analyzed. The measurement uncertainty of the calibration light source is 3.57%. The experimental results show that the calibration light source can meet the needs of laboratory radiometric calibration of optical load of visible / near-infrared space below 1 600 mm in diameter and can realize intelligent programmable control and improve the calibration accuracy.