International Electrotechnical Commission
Glossary

ENradiometer 
instrument for measuring the intensity of solar irradiance

NOTE 1 See also IEV 845-05-06

NOTE 2 Commonly, a radiometer is a thermal instrument using thermocouples or thermopiles and is independent of wavelength

a) absolute radiometer

radiometer that can measure or calculate the absolute quantity of radiant power based on physical laws and the known physical constants of its components

b) pyranometer

radiometer normally used to measure global irradiance on a horizontal plane

NOTE 3 A pyranometer can also be used to measure diffuse irradiance when used with a shade ring or disc

NOTE 4 A pyranometer can also be used to measure total irradiance on an inclined plane, which would include radiation reflected from the foreground

c) pyrheliometer

radiometer, including with a collimator, used to measure direct irradiance

NOTE 5 A pyrheliometer is sometimes called a normal incidence pyrheliometer, or NIP

d) spectroradiometer

instrument used to measure spectral irradiance distribution of an incident radiation as the function of wavelength


TC/SC:82Terms     Info     Publications
Published in:IEC 61836, ed. 2.0 (2007-12) Terms     Info
Reference number:3.5.7

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