Broadband UV Radiometers FOR THE ACCURATE MEASUREMENT OF SOLAR ULTRAVIOLET RADIATION Spectral responses optimised for UVA, UVB and UVE/UVI Temperature stabilised detection system Cost eective dual-band models ‘Total UV’ radiometer

Introduction The Ultraviolet (UV) part of the solar spectrum has several benecial eects for human biology, but too much can be very harmful. The UV region covers the wavelength ranges 100-280 nm (UVC), 280-315 nm (UVB) and 315-400 nm (UVA). Almost all UVC, and approximately 90 % of UVB from the sun is absorbed by the Earth’s atmosphere. UV radiation helps to produce Vitamin D, but it can also burn the skin and cause cancers, melanoma and cataracts. UV radiation measured with a similar response to the human skin is termed Erythemally active UV irradiance (UVE) and is to calculate the Global Solar...

UVS Radiometers UVS instruments are fully weather protected and suitable for use in all environments. Adjustable feet and a bubble level are used to ensure that the radiometer is horizontal. A precision quartz dome and specially shaped diffuser provide class-leading directional response. The detection system includes optical lters and a phosphor that determine the spectral response. The phosphor is very sensitive to low levels of ultraviolet radiation and is stimulated by the UV to emit green light, which is detected by a photodiode. The system is temperature stabilised at +25 °C to prevent changes...

Spectral response (see graphs) Typical calibration factor Typical sensitivity Output range Non-stability (change/year) Non-linearity (over full range) Zero offset (in darkness) Directional error Temperature stabilized internally at +25 °C, ±2 °C Temperature dependence of sensitivity Impedance (nominal) Operating temperature Expected daily uncertainty Power supply Calibration data supplied Internal temperature output Nominal sensitivity, spectral response, solar zenith angle corrections, Ozone column corrections UVIATOR software Included, corrects for solar zenith angle and Ozone column concentration...