The optical properties of semi-transparent components used as multifunctional coatings or in various non-imaging devices are not always completely known a priori. The quality of plastic covers used in night sky brightness monitors, such as Sky Quality Meter (SQM), can deteriorate with age, causing initially transparent windows to become semi-transparent media that absorb and scatter light. We demonstrate here that the asymmetry parameter, single-scattering albedo, and volume extinction coefficient of such a diffusing optical element can be determined by measuring the light escaping from its outer interface.

中文翻译：

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半透明传感器盖板的光学特性由其光谱强度分布函数确定


用作多功能涂层或各种非成像设备中的半透明组件的光学特性并不总是完全先验的。夜空亮度监测器中使用的塑料盖板（例如 Sky Quality Meter （SQM））的质量会随着年龄的增长而恶化，导致最初的透明窗口变成吸收和散射光线的半透明介质。我们在这里证明，这种漫射光学元件的不对称参数、单散射反照率和体积消光系数可以通过测量从其外部界面逸出的光来确定。