radiometer(redirected from roentgenometer)
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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.
(General Physics) any instrument for the detection or measurement of radiant energy
ra•di•om•e•ter(ˌreɪ diˈɒm ɪ tər)
1. an instrument for demonstrating the transformation of radiant energy into mechanical work.
2. an instrument for detecting small amounts of radiant energy.
ra`di•o•met′ric (-oʊˈmɛ trɪk) adj.
A device used to detect and measure radiation. Radiometers consist of a glass bulb containing a partial vacuum in which four diamond-shaped paddles are mounted on a central axis. Each paddle is black on one side and silvery on the other. When radiation, such as sunlight, strikes them, the black side absorbs radiation and the silvery side reflects it, resulting in a temperature difference between the two sides that causes the paddles to spin. The stronger the radiation, the faster the paddles spin.
an instrument for measuring the intensity of radiant energy, composed of vanes which rotate at speeds proportionate to the intensity of the energy source. — radiometric, adj.See also: Sun
an instrument for measuring the intensity of radiant energy, composed of vanes which rotate at speeds proportionate to the intensity of the energy source. — radiometric, adj.See also: Instruments
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|Noun||1.||radiometer - meter to detect and measure radiant energy (electromagnetic or acoustic)|
Crookes radiometer - electromagnetic radiometer consisting of a small paddlewheel that rotates when placed in daylight
meter - any of various measuring instruments for measuring a quantity
radiomicrometer - radiometer that is extremely sensitive
Rayleigh disk - an acoustic radiometer consisting of a light disk suspended from a quartz thread; when exposed to a progressive sound wave its torque can measure velocity