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- Q850281 subject Q6375730.
- Q850281 subject Q8411328.
- Q850281 abstract "A radiometer or roentgenometer is a device for measuring the radiant flux (power) of electromagnetic radiation. Generally, a radiometer is an infrared radiation detector or ultraviolet detector.The name Radiometer is frequently used to refer to a Crookes radiometer ("light-mill"), an early model device wherein a rotor (having vanes which are dark on one side, and light on the other) in a partial vacuum spins when exposed to light. A common myth (one originally held even by Crookes) is that the momentum of the absorbed light on the black faces makes the radiometer operate. If this were true however, the radiometer would spin away from the non-black faces, since the photons bouncing off those faces impart even more momentum than the photons absorbed on the black faces. Photons do exert radiation pressure on the faces, but those forces are dwarfed by other effects. The final explanation depends on having just the right degree of vacuum, and is more related to the flow of heat than the direct effect of photons. The Nichols radiometer operates on a different principle and is more sensitive than the Crookes type. A microwave radiometer operates in the microwave wavelengths. The radiometer contains argon gas to enable it to rotate.The MEMS radiometer, invented by Patrick Jankowiak, can operate on the principles of Nichols or Crooke and can operate over a wide spectrum of wavelength and particle energy levels.".
- Q850281 thumbnail Crookes_radiometer.jpg?width=300.
- Q850281 wikiPageExternalLink watch?v=teEhoUB-FQE&list=UUXrJjdDeqLgGjJbP1sMnH8A.
- Q850281 wikiPageWikiLink Q10776237.
- Q850281 wikiPageWikiLink Q11386.
- Q850281 wikiPageWikiLink Q11388.
- Q850281 wikiPageWikiLink Q11391.
- Q850281 wikiPageWikiLink Q127995.
- Q850281 wikiPageWikiLink Q1334758.
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- Q850281 wikiPageWikiLink Q368891.
- Q850281 wikiPageWikiLink Q3814470.
- Q850281 wikiPageWikiLink Q4677550.
- Q850281 wikiPageWikiLink Q619.
- Q850281 wikiPageWikiLink Q6375730.
- Q850281 wikiPageWikiLink Q649036.
- Q850281 wikiPageWikiLink Q653486.
- Q850281 wikiPageWikiLink Q680509.
- Q850281 wikiPageWikiLink Q7187861.
- Q850281 wikiPageWikiLink Q8411328.
- Q850281 wikiPageWikiLink Q852212.
- Q850281 wikiPageWikiLink Q9065697.
- Q850281 type Thing.
- Q850281 comment "A radiometer or roentgenometer is a device for measuring the radiant flux (power) of electromagnetic radiation. Generally, a radiometer is an infrared radiation detector or ultraviolet detector.The name Radiometer is frequently used to refer to a Crookes radiometer ("light-mill"), an early model device wherein a rotor (having vanes which are dark on one side, and light on the other) in a partial vacuum spins when exposed to light.".
- Q850281 label "Radiometer".
- Q850281 depiction Crookes_radiometer.jpg.