Pyranometer
A pyranometer is a meteorological instrument used to measure in a very precise manner solar radiation over the surface of the earth.
It is a sensor designed to measure the density of the solar radiation flow (kilowatts per square meter) in a field of 180 degrees.
Generally three radiation measures are used: totally semi-spherical, diffused and direct. For diffuse and semi-spherical radiation measurements, direct radiation is suppressed using a parasol disc.
The physical principle generally used for measuring is a thermopile sensor that absorbs solar radiation coming through two semi-spherical glass domes. The measurements are expressed in kW/m2.
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PYRANOMETER