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GUVis-3511 Ground-Based UV-Visible / PAR Radiometer

GUVis-3511 radiometer (center) with BioSHADE drive (white cylinder on the right) and BioGPS (black dome in the background).GUVis-3511 radiometer (center) with BioSHADE drive (white cylinder on the right) and BioGPS (black dome in the background).The GUVis-3511 radiometer is the latest version of BSI's GUV series of ground-based instruments. The GUVis-3511 is available with as many as 19 channels, which can be selected from 30 wavelengths, ranging from 305 to 1,640 nm. The radiometer can also measure Photosynthetically Available Radiation (PAR: 400-700 nm).

The electronics of the instrument are based on BSI’s microradiometer technology, which features unprecedented performance with respect to dynamic range, linearity, speed, and expandability. The instrument also features a new irradiance collector covering the spectral range from the UV to the infrared (IR).

The instrument can be equipped with a shadowband accessory, the BioSHADE, which allows alternating measurements of global (sun + sky) and diffuse solar irradiance. These measurements allow the calculation of direct solar irradiance.

GUV radiometers were introduced in 1992 and are being used to monitor geographic variations in national and international networks. Similar to its predecessors, the GUVis-3511 is suitable for use in long-term research programs. Depending on configuration, the GUVis-3511 affords the retrieval of aerosol optical depth, cloud optical thickness, total column ozone, and water vapor column — four crucial variables used in characterizing the solar spectrum.


  • Measures surface UV, visible, and infrared irradiance in up to 19 user-selectable wavebands and PAR
  • Based on state-of-the-art microradiometer technology
  • Features newly-designed irradiance collector with small cosine error from the UV to the IR
  • Uses specialized, hard-coat, multicavity interference filters with excellent long-term stability
  • Rugged, powder-coated aluminum housing
  • Environmentally sealed and temperature-stabilized to 40 or 50 °C for long-term operation in harsh environments
  • RS-232 serial or USB output for connection to a PC
  • Windows®-based µLogger data acquisition software included
  • Instrument inclination sensors (pitch and roll) included
  • Hard-shell travel case included
  • Optional BioSHADE shadowband accessory suitable for land and ship-based deployments
  • Optional BioGPS Global Positioning System
  • Optional spectral and directional characterization of the radiometer

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Bernhard, G. and P. Petkov. (2019). Measurements of spectral irradiance during the solar eclipse of 21 August 2017: reassessment of the effect of solar limb darkening and of changes in total ozone, Atmospheric Chemistry and Physics, 19, 4703-4719, doi: The paper is available here. A summary of measurements during the Great American Eclipse of August 21, 2017, can also be found here.
Ockenfuß, P., C Emde, B. Mayer, and G. Bernhard. (2020). Accurate 3-D radiative transfer simulation of spectral solar irradiance during the total solar eclipse of 21 August 2017, Atmos. Chem. Phys.20, 1961–1976, doi: The paper is available here.
Witthuhn, J., H. Deneke, A. Macke, and G. Bernhard. (2017). Algorithms and uncertainties for the determination of multispectral irradiance components and aerosol optical depth from a shipborne rotating shadowband radiometer. Atmospheric Measurement Techniques, 10(2), 709-730. The paper is available here.
Last Updated on Thursday, 05 March 2020 15:30