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1. A device that measures the intensity of radiant energy, consisting of a partially evacuated glass bulb containing lightweight vertical vanes, each blackened on one side, suspended radially about a central vertical axis to permit their revolution about the axis as a result of incident radiation. Also called light mill.
2. An instrument that detects electromagnetic radiation.

ra′di·o·met′ric (-ō-mĕt′rĭk) adj.
ra′di·om′e·try n.


the measurement of radiant energy by means of a radiometer, an instrument composed of vanes which rotate at speeds proportionate to the intensity of the energy source. — radiometric, adj.
See also: Physics
the measurement of radiant energy by means of a radiometer. — radiometric, adj.
See also: Sun
the measurement of radiant energy by means of a radiometer. — radiometric, adj.
See also: Measurement
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