COMPACT REFERENCE UVC LED SOURCE

Abstract

There are a number of problems in metrological insurance in the UV spectral region. First, it is a significant reduction in the accuracy of the transfer of quantities from national standards of the corresponding optical quantities to working units in the CIE UV ranges. Second, when measuring in the UV CIE ranges, it is necessary to use a power meter with constant spectral sensitivity inside these ranges and zero 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 by difference in spectral distributions of the radiation intensity of the test and reference radiation sources. One of the promising ways to improve the accuracy of measurements in the UV spectral region is the use of reference radiation sources created based on LEDs, due to their stability and long lifetime.A compact reference UVC source based on state-of-the-art commercially available LED were designed and constructed at B.I. Stepanov Institute of Physics NAS of Belarus. The paper presents the design and results of the study of the optical characteristics of the radiation of the reference UVC LED source. A power density of the compact reference UVC LED source is >200 μW/cm2, which provides a fine level for calibrating UV radiometers in range UVC.