比值辐射计空间环境适应性设计及验证

结合卫星发射以及在轨运行过程中所处的环境条件,对"积分球+匀光板+电磁光开关"形式的比值辐射计进行空间环境适应性设计.对结构薄弱环节进行强化加固设计,通过降低器件功耗、表面热处理等方式保持比值辐射计在真空热环境下的温度稳定,采用航天级光学涂层辅以结构屏蔽设计保证抗辐照能力.通过力学试验、热真空试验以及积分球光学涂层辐照试验进行验证.力学试验结果显示比值辐射计基频约为540Hz,振动前后比值辐射计辐射比变化小于0.31%,证明比值辐射计具有良好的结构稳定性,空间力学条件下的结构强度和刚度均满足基频大于100 Hz的设计要求.热真空试验过程中比值辐射计遥测输出稳定,各功能模块均工作正常.辐照试验后,比值辐射计光学涂层方向-半球反射比在485nm波段的最大衰变小于2%,红外波段无明显变化,该衰变对定标器在轨应用性能的影响可以忽略.研究结果表明,比值辐射计具有良好的空间环境适应性,可在复杂空间环境下进行稳定、可靠的工作,满足航天应用需求.

Design and Verification of Space Adaptability for Ratioing Radiometer

According to the environment during launch and on orbit,special design was carried out to improve spatial environment adaptability for ratioing radiometer which consists of integrating sphere,diffuser shutter and electronic optic cut.Weak part of ratioing radiometer was strengthened after making mechanical simulation.The temperature stability under thermal vacuum environment was realized by limiting the power of components and surface heat treatment.The radiation-proof ability was guaranteed by employing space-grade optical coating and making structure shield.Spatial environment adaptability was verified by mechanical,thermal vacuum and space radiation experiments.Mechanical testing results show that the fundamental frequency of the ratioing radiometer is about 540 Hz.The variation of the ratio for sun view to diffuser view of ratioing radiometer after mechanical experiments is within 0.31％.The structural strength and rigidity of the ratioing radiometer could meet the design requirement that the fundamental frequency should be above 100 Hz.The electronic components of the ratioing radiometer maintain normal during thermal vacuum experiments.The degradation of directional/hemisphere reflectance for the ratioing radiometer at 485 nm after space radiation tests is within 2％,while the change of directional/hemisphere reflectance in longer wavelength is negligible.The above results show that the ratioing radiometer has good space adaptability and is able to work steadily and reliably in complex space environment,which meets the needs for aerospace application requirements.