GUV-511 radiometer installed at Palmer Station, Antarctica.GUV instruments are above-water radiometers that measure global irradiance from Sun and sky at several wavelengths in the UV or visible. GUV models are designed for long-term monitoring applications where excellent radiometric stability is paramount.
The original model of the GUV series was the GUV-511. It was introduced in 1992 and featured five channels at 305, 320, 340, and 380 nm, as well as a channel to measure Photosynthetically Active Radiation (PAR; 400–700 nm). To this day, GUV-511 radiometers are being used to monitor geographic variations in UV exposure in several national and international monitoring networks (see Publications).
The GUV-511 was retired in 2003 and replaced by the GUV-2511 radiometer, which has a larger dynamic range and expanded channel selection using electronics developed for the PRR-800 class of instruments. GUV-2511 radiometers continue to be avaialble.
In 2014, the GUVis-3511 was introduced. This all-new instrument is based on BSI’s microradiometer technology. The new electronics feature unprecedented performance with respect to dynamic range, linearity, speed, and expandability. The instrument is built with the same high-quality filters and photodiodes used in previous versions.
GUVis-3511 radiometers are available with as many as 19 channels, which can be selected from 30 wavelengths, ranging from 305 to 1,640 nm. The instrument also features a newly-designed irradiance collector covering the spectral range from the UV to the infrared (IR) with a small "cosine error".
The GUVis-3511 is the first instrument of the GUV series that can be equipped with a shadowband accessory, the BioSHADE, which allows alternating measurements of global (sun + sky) and diffuse solar irradiance. Depending on configuration, the GUVis-3511 affords the retrieval of aerosol optical depth, cloud optical thickness, total column ozone, and water vapor column.