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How do thermopile pyranometers work?
The physics behind the thermopile pyranometer
Solar radiation can be measured according to the Seebeck effect. This thermopile effect is part of a physical phenomenon called thermoelectric effect, in which the temperature difference between two dissimilar electrical conductors produces a voltage difference. The potential difference between the two conductors kept at different temperatures is defined as the Seebeck effect. A thermopile pyranometer is made up of many such junctions as described above, placed in line. The warm side is exposed to solar radiation, whilst the cold side is in the shade. By measuring the voltage between the 2 joints, you can find the radiation irradiating from the sensor. The voltage gives a measure of the solar irradiation.The thermopile pyranometer design explained

Which type of thermopile pyranometer offers the most precise readings?
According to ISO9060, which sets out pyranometer standards, thermopile pyranometers are classified as follows, in ascending order of costs and precision:- Secondary Standard pyranometers
- First class pyranometers
- Second class pyranometers