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17 January 2002 Retrieval of investigated source spectrum for ultraviolet radiation measurements
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An alternative method using the spectrum retrieval technique for accuracy increase of ultraviolet UV measurements is presented. The irradiances measured by the UV filter radiometer with narrow filters in investigated range for retrieval spectral function are used. Irradiances in narrow intervals are substituted to average values, which do for an effective wavelength. An approximated function is employed to extract the source spectrum from number of irradiances average values. The extracted spectrum is useful in the correction of UVA, UVB, UVC and total UV irradiances, and in calculating the biologically effective ultraviolet radiation for studies of the effect of increased UV radiation. The criterion of reached level of accuracy is relation of measured irradiance value to calculated one. If the reached level of accuracy was not enough, the procedure repeated. The mathematical model of measurement process to test the technique and installation of its optimal parameters was employed. Some UV spectrum sources were used in modeling, for example, solar, tungsten lamp, deuterium lamp and other. They were calculated or measured before. The results show that using the new technique ensures the reasonable level of uncertainty not more than 10%. It quite satisfies the needs of natural monitoring and medicine. The new technique also has appeared useful to some problems of pirometry and photometry.
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Natalia A. Semenova, Alexander D. Kupko, and Leonid A. Nazarenko "Retrieval of investigated source spectrum for ultraviolet radiation measurements", Proc. SPIE 4482, Ultraviolet Ground- and Space-based Measurements, Models, and Effects, (17 January 2002);

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