Pyranometer
Instrument for measuring solar irradiance / From Wikipedia, the free encyclopedia
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A pyranometer (from Greek πῦρ (pyr) 'fire', and ἄνω (ano) 'above, sky') is a type of actinometer used for measuring solar irradiance on a planar surface and it is designed to measure the solar radiation flux density (W/m2) from the hemisphere above within a wavelength range 0.3 μm to 3 μm.
A typical pyranometer does not require any power to operate. However, recent technical development includes use of electronics in pyranometers, which do require (low) external power (see heat flux sensor).