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.
- stamp duty
- stamped addressed envelope
- stampede
- stampeder
- stamper
- stamp hinge
- stamping ground
- stamp mill
- stamp office
- stamp one's authority (or personality or style etc.) on
- stamp paper
- stamp something out
- stan
- stance
- stanch
- stanchion
- stanchioned
- stand
- stand a chance
- stand alone
- stand and deliver!
- standard
- standard assessment task
- standard-bearer
- Standardbred