Validated UV-C bidirectional reflectance distribution function measurements with a spectrophotometer directional reflectance module

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Abstract

The efficacy and safety of UV disinfection systems depends on the radiant flux throughout the space being disinfected, which in turn depends on the directional reflectance of materials located within the space. Little publicly available data exists on the directional reflectance of common materials in the germicidal UV spectral range, 220 nm to 280 nm. We present methods to validate directional reflectance (bidirectional reflectance distribution function) measurements performed with a commercial spectrophotometer and provide measurement results for materials commonly found in public spaces. The data presented may lead to improved models of UV disinfection efficacy and safety, and the methods described will enable other researchers to readily collect traceable UV directional reflectance data.

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Keywords

Public safety, Optical / photometry / laser metrology, Materials characterization, Indoor air quality and Health

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