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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


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
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The guide has now grown beyond handy field size, so with this edition in splits into two parts, the other on infrared optics, materials, and radiometry. Here Daniels focuses on fundamental background issues for optical detection processes.
Microwave radiometry features enable CubeSats to gather weather
The new data is coming from NASA's Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) instrument, which is on board the space agency's Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) satellite.
Lucky's immediate next steps to advance exploration on the property will be an airborne magnetics combined with radiometry survey with 3D inversion, improving the existing dirt road and trails to an all-weather 14 km gravel road, to be followed by an aggressive grid-style comprehensive sampling program along the two identified porphyry systems on Fortuna 3 as well as regional prospecting on the 40 km major regional NNE structure and other major regional NNE trending structures observed on the property.
QNA Doha EXPERTS from the Turkish Atomic Energy Authority and the Department of Radiation and Chemicals Protection at the Ministry of Municipality and Environment (MME) are holding meetings in Doha to cooperate in radiometry and exchange of expertise in this field in the framework of the ministry's interest in developing and modernising its tools and control components in terms of human and technical development, in collaboration and coordination with the International Atomic Energy Agency (IAEA).
The microwave radiometry is based on the principle of the Planck's radiation law, for instance on measurement of power noise radiated from the measured tissue [5-7].
Small satellites with microwave radiometry, radar, lidar and IR sounders can address other liability issues that are of significant interest to the P/C community.
The theory of radiometry indicates that transmittance T is the luminous flux ratio of transmitted light [[phi].sub.t] to incident light [[phi].sub.i] [18], which is expressed as
The data came from TIMED's spectroscopy instrument called Sounding of the Atmosphere using Broadband Emission Radiometry (SABER).
Other forms of obtaining brain temperature has much higher degrees of validity and reliability such as microwave radiometry, magnetic resonance thermometry, and ultrasound thermometry, however such instruments were unavailable in the existing laboratory (Corbett et al., 1997; Maruyma et al., 2000).