High Quality Content by WIKIPEDIA articles! A net radiometer is a type of actinometer used to measure net radiation (NR) at the earth's surface in meteorological applications. The name net radiometer reflects the fact that it is supposed to measure incoming minus upwelling radiation. Although there are many types of net-radiometers, the 4-component design at present is most popular for scientific applications. he SW solar radiation spectrum extends approximately from 300 to 2800 nm. Pyranometers usually cover that spectrum with a spectral sensitivity that is as “flat” as possible. The LW longwave or Far Infra RED (FIR) extends from 4500 to 50000 nm. This part of the spectrum is covered by a pyrgeometer.

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