SRA01 albedometer

Second class albedometer

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SRA01 albedometer is an instrument that measures the solar albedo, or solar reflectance, and net solar radiation. It is composed of two second class pyranometers with thermopile sensors, the upper one measuring global radiation, the lower one measuring reflected solar radiation. It complies with the latest ISO and WMO standards.

Albedo, also called solar reflectance, is defined as the ratio of the reflected to the global radiation. The solar albedo depends on the directional distribution of incoming radiation and on surface properties at ground level. Albedos of typical surfaces range from about 4 % for fresh asphalt, and 15 % for green grass to 90 % for fresh snow.

Using SRA01 is easy. The albedometer is composed of two pyranometers, the upper one measuring global solar radiation, the lower one measuring reflected solar radiation. The irradiance in W/m2 in each direction is calculated by dividing the pyranometer output, a small voltage, by the sensitivity. The sensitivity of both pyranometers, model SR01, is provided on the SRA01 product certificate. The albedo is calculated by dividing the reflected radiation by the global radiation. The working principle and specifications of the pyranometers can be found in the SRA01 manual. SRA01 can be connected directly to commonly used datalogging systems.

Albedometers are used for general meteorological observations, building physics, roof reflectance studies, climate studies and solar collector testing. A common application is for outdoor solar radiation measurements as part of a meteorological station. This application requires horizontal levelling; a bubble level is included. SRA01 is made to fit a ¾ inch NPS mounting tube.

Applicable instrument-classification standards are ISO 9060 and WMO-No. 8. Calibration is according to ISO 9847 and ASTM G207-11. SRA01 may also be used for measurements according to ASTM E1918 - 06 Standard Test Method for Measuring Solar Reflectance of Horizontal and Low-Sloped Surfaces in the Field.

Suggested use

  • agricultural networks
  • general meteorological observations
  • building physics, roof reflectance studies

Options

  • longer cable, in multiples of 5 m
  • sun screens

See also

 

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