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An ultraviolet-B/visible/near-infrared transfer radiometer

One of the main problems of natural radiation measurements, especially for ultraviolet-B (UVB) radiation, is the calibration and quality control of the radiometers used. We have developed a simple radiometer which allows the comparison of other radiometers, spectroradiometers and light sources. The filter radiometer consists of a Spectralon diffuser, interference filters, a silicon photodiode and signal amplification. The peak wavelengths of the thirteen interference filters are distributed between 301 nm and 1040 nm. The measurements of the UVB edge of the solar spectrum require very stable filters with a small half-width (FWHM). We used five special UVB filters with a FWHM of about 1 nm. The transfer radiometer has a dynamic range of 108; its resolution is better than 1 part in 104 and the smallest detectable spectral irradiance is 1,2 × 10-9 W cm-2 nm-1 at 305,48 nm. Using this transfer radiometer, we compared four different irradiation sources: two 1 kW FEL lamps (a PTB- and a NIST-based standard), one 200 W deuterium lamp (PTB-related standard) and the primary standard irradiation source BESSY. It was found that the deviation between the four radiation sources was in agreement with the standard deviation of each irradiation source.