Reference UVB and UVC LED sources

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This article is devoted to investigations of ultraviolet (UV) reference radiation sources for the CIE B and C spectral ranges. UV radiation is widely used to solve various engineering and scientific problems. Efficiency, quality and safety of work performed using UV radiation is largely determined by the quality of the preliminary metrological support of these works.There are a number of problems in metrological support in the UV spectral range. First of all, it is a significant reduction in the accuracy of the transfer of size of the units from the national measurement standards of the corresponding optical quantities to working measuring instruments in the CIE A UV radiation range (from 400 to 315 nm) and especially B (from 315 to 285 nm) and C (from 285 to 200 nm). Second, when measuring in the CIE A, B and C ranges, it is necessary to use a power meter with constant spectral sensitivity inside these ranges and zero one outside it, which is very problematic due to the lack of high-quality UV filters. Third, the accuracy of the results of measuring optical characteristics of UV radiation is reduced significantly due to the difference in spectral distributions of the radiation intensity of the test and reference radiation sources. Then it can be predicted that in the next 5 years, traditional sources of UV radiation will be replaced by UV LEDs in many applications. However, the previously developed methods of measuring the characteristics and parameters of optical radiation are not fully applicable to the LEDs emission.One of the promising ways to improve the accuracy of measurements in the UV spectral range is the use of reference radiation sources created on the basis of LEDs, due to their stability and long lifetime. The Institute of Physics of the National Academy of Sciences of Belarus has developed reference radiation sources for the CIE B and C UV ranges based on LEDs.The article describes the design of the created reference sources. The results of the study of the spectral, energy and spatial characteristics of the radiation of the reference radiation sources, as well as the impact on these characteristics of structural elements, are considered.