pyrheliometer
/pəːˌhiːlɪˈɒmɪtə/(also pyroheliometer) Meteorology
noun
An instrument for measuring solar radiation incident on the earth (the solar constant).
- In the original form of the instrument the sun's rays were caused to fall perpendicularly for a certain time on a blackened strip of metal, or on water or mercury in a blackened, closed, shallow vessel, and its consequent rise in temperature observed. Modern ones usually measure the solar radiation entering a black-body cavity by measuring its rise in temperature of the cavity..
Origin
Mid 19th century; earliest use found in Reports of the British Association for the Advancement of Science. From pyro- + helio- + -meter, after French pyrhéliomètre.
- Jung, Carl
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