A pyrgeometer (from Greek πῦρ (pyr) 'fire' and γεω (geo), which is the combining form of γῆ (gê) 'earth') is a device that measures near-surface infra-red (IR) radiation, approximately from 4.5 μm to 100 μm on the electromagnetic spectrum (thereby excluding solar radiation). It measures the resistance/voltage changes in a material that is sensitive to the net energy transfer by radiation that occurs between itself and its surroundings (which can be either in or out).
A pyrgeometer (from Greek πῦρ (pyr) 'fire' and γεω (geo), which is the combining form of γῆ (gê) 'earth') is a device that measures near-surface infra-red (IR) radiation, approximately from 4.5 μm to 100 μm on the electromagnetic spectrum (thereby excluding solar radiation). It measures the resistance/voltage changes in a material that is sensitive to the net energy transfer by radiation that occurs between itself and its surroundings (which can be either in or out).
Source: Wikipedia "Pyrgeometer" · CC BY-SA 4.0
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