5.4.2. Photoelectric pyranometers

Photoelectric radiation probes measure the irradiance in the solar spectrum in the visible range and in the short-wave infrared range. Through filtering of the incoming radiation, their spectral range is tuned to the range of wavelengths of interest, e.g. UVB, UVA, visible light. Photoelectric global radiation sensors measure both direct and diffuse solar radiation. They usually cover the spectral range from 400 to 1100 nm. The spectral sensitivity curve should be flat for optimal results. Some companies manufacture miniaturized versions on request (see Stabentheiner et al., 2012)