抄録
A new band-spectral solar ultraviolet-B (UV-B: 290-320 nm) radiometer was developed to achieve a simple and accurate outdoor measurement. The spectral response of the radiometer has a maximum at 305 nm and has a 20-nm bandwidth. In this radiometer, incident solar UV-B irradiance is converted to visible irradiance by a phosphor layer and is detected by a Si-photodiode. The spectral, cosine, azimuth and temperature responses of the radiometer have been evaluated. Contamination by UV-A radiation longer than 320 nm in wavelength is less than 6% of the measured UV-B radiation. No changes in instrumental sensitivity nor in the spectral response of the radiometer have been found during periodical checks over a two-year span. Results indicate that this radiometer is useful for continuous, high time-resolution measurement of solar UV-B radiation.
