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Reflectance stability analysis of Spectralon diffuse calibration panels

机译：Spectralon漫反射校准面板的反射稳定性分析

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摘要

Abstract: The multi-angle imaging spectroradiometer (MISR) will use deployable diffuse reflectance panels to provide periodic radiometric calibrations of its nine cameras while in flight. Near- lambertian reflectance characteristics are desirable to facilitate flat-field camera intercomparisons. Also required is panel spatial and spectral uniformity, and stability with time. Spectralon, a commercially available polytetrafluoroethylene (PTFE) compound, has been baselined in the MISR design. To assess the suitability of this material, a series of degradation tests were planned and implemented. These included UV vacuum exposure and proton bombardment tests which simulated the exposure levels to be encountered during the mission life. Proton levels are now considered too low to be of concern, but UV vacuum tests demonstrate sensitivity to material contamination. Material investigations have concluded that hydrocarbons are present in the bulk of the material, and that plastic packaging materials can introduce additional surface-layer contamination. It is found, however, that these unwanted elements can be eliminated through vacuum pumping at elevated temperatures. Exposure to a UV source, while in vacuum, is again planned for a set of targets which have been vacuum baked. This will assess the stability of the pure PTFE form.!
机译：摘要：多角度成像光谱仪（MISR）将使用可展开的漫反射面板对飞行中的9台摄像机进行定期辐射校准。需要近朗伯反射特性来促进平场相机的比较。还需要面板空间和光谱均匀性以及随时间的稳定性。 Spectralon是一种可商购的聚四氟乙烯（PTFE）化合物，已在MISR设计中成为基准。为了评估这种材料的适用性，计划并实施了一系列降解测试。这些措施包括紫外线真空暴露和质子轰击测试，这些测试模拟了任务寿命期间遇到的暴露水平。现在认为质子水平太低而不必担心，但是紫外线真空测试表明对材料污染敏感。材料研究得出的结论是，大部分材料中都存在碳氢化合物，而塑料包装材料会引入额外的表面层污染。但是，发现可以通过在高温下抽真空来消除这些不需要的元素。在真空中，再次计划将一组真空烘烤的目标暴露于紫外线源中。这将评估纯PTFE形式的稳定性。

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