Infrared - définition. Qu'est-ce que Infrared
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Qu'est-ce (qui) est Infrared - définition

ELECTROMAGNETIC RADIATION WITH LONGER WAVELENGTHS THAN THOSE OF VISIBLE LIGHT
Infra-red radiation; Infra-red; Infrared radiation; Near-infrared; Infrared Radiation; Infrared light; Near infrared; Infra-red light; Near Infrared; 1550 nm; LWIR; MWIR; Infra red; Infared; 1300 nm; Infrared spectrum; Infra Red; Infra-Red; InfraRed; Infrared sources; Long-wave infrared; Line of light; Infrared communication; Calorific rays; Calorific Rays; Mid-infrared; Infrared rays; Thermal infrared; Infra-red reflectography; Infrared reflectography; Infrared Rays; Infrared Ray; IR-A; IR-B; IR-C; IR radiation; NIR Photons; MIR photons; Short-wavelength infrared; Infrared bands; Short-wave infrared; Mid-wave infrared; Near-infrared light; Mid infrared; 830 nm; 850 nm; Thermal infrared radiation; Applications of infrared radiation; History of infrared science; Infrared source
  • Active-infrared night vision: the camera illuminates the scene at infrared wavelengths invisible to the [[human eye]]. Despite a dark back-lit scene, active-infrared night vision delivers identifying details, as seen on the display monitor.
  • Plot of atmospheric transmittance in part of the infrared region
  • Infrared light from the [[LED]] of a [[remote control]] as recorded by a digital camera
  • [[Beta Pictoris]] with its planet Beta Pictoris b, the light-blue dot off-center, as seen in infrared. It combines two images, the inner disc is at 3.6 μm.
  • Materials with higher [[emissivity]] appear closer to their true temperature than materials that reflect more of their different-temperature surroundings. In this thermal image, the more reflective ceramic cylinder, reflecting the cooler surroundings, appears to be colder than its cubic container (made of more emissive silicon carbide), while in fact, they have the same temperature.
  • The [[greenhouse effect]] with molecules of methane, water, and carbon dioxide re-radiating solar heat
  • hair salons]], c. 2010s
  • Reflected light photograph in various infrared spectra to illustrate the appearance as the wavelength of light changes.
  • An infrared reflectogram of ''[[Mona Lisa]]'' by [[Leonardo da Vinci]]
  • upright=0.9
  • A [[pseudocolor]] image of two people taken in long-wavelength infrared (body-temperature thermal) radiation.
  • IR satellite picture of cumulonimbus clouds over the [[Great Plains]] of the United States.
  • Thermography helped to determine the temperature profile of the [[Space Shuttle thermal protection system]] during re-entry.
  • date=2011-07-26 }}, Photonik</ref>
  • false-color]] infrared space telescope image has blue, green and red corresponding to 3.4, 4.6, and 12&nbsp;[[μm]] wavelengths, respectively.
  • Infrared radiation was discovered in 1800 by William Herschel.

infrared         
<electronics> (IR) Electromagnetic waves in the frequency range just below visible light corresponding to radiated heat. IR waves can be generated by a kind of LED and are often used for remote controls for televisions etc. and in some docking stations. (1997-01-30)
infrared         
also infra-red
1.
Infrared radiation is similar to light but has a longer wavelength, so we cannot see it without special equipment.
ADJ: ADJ n
2.
Infrared equipment detects infrared radiation.
...searching with infra-red scanners for weapons and artillery.
ADJ: ADJ n
infrared         
¦ noun electromagnetic radiation having a wavelength just greater than that of red light but less than that of microwaves, emitted particularly by heated objects.
¦ adjective of or denoting such radiation.

Wikipédia

Infrared

Infrared (sometimes called infrared light and IR) is electromagnetic radiation (EMR) with wavelengths longer than those of visible light and shorter than radio waves. It is therefore invisible to the human eye. IR is generally understood to encompass wavelengths from around 1 millimeter (300 GHz) to the nominal red edge of the visible spectrum, around 700 nanometers (430 THz). IR is commonly divided between longer wavelength thermal infrared that is emitted from terrestrial sources and shorter wavelength near-infrared that is part of the solar spectrum. Longer IR wavelengths (30 μm-100 μm) are sometimes included as part of the terahertz radiation range. Almost all black-body radiation from objects near room temperature is at infrared wavelengths. As a form of electromagnetic radiation, IR propagates energy and momentum, exerts radiation pressure, and has properties corresponding to both those of a wave and of a particle, the photon.

It was long known that fires emit invisible heat; in 1681 the pioneering experimenter Edme Mariotte showed that glass, though transparent to sunlight, obstructed radiant heat. In 1800 the astronomer Sir William Herschel discovered that infrared radiation is a type of invisible radiation in the spectrum lower in energy than red light, by means of its effect on a thermometer. Slightly more than half of the energy from the Sun was eventually found, through Herschel's studies, to arrive on Earth in the form of infrared. The balance between absorbed and emitted infrared radiation has an important effect on Earth's climate.

Infrared radiation is emitted or absorbed by molecules when changing rotational-vibrational movements. It excites vibrational modes in a molecule through a change in the dipole moment, making it a useful frequency range for study of these energy states for molecules of the proper symmetry. Infrared spectroscopy examines absorption and transmission of photons in the infrared range.

Infrared radiation is used in industrial, scientific, military, commercial, and medical applications. Night-vision devices using active near-infrared illumination allow people or animals to be observed without the observer being detected. Infrared astronomy uses sensor-equipped telescopes to penetrate dusty regions of space such as molecular clouds, to detect objects such as planets, and to view highly red-shifted objects from the early days of the universe. Infrared thermal-imaging cameras are used to detect heat loss in insulated systems, to observe changing blood flow in the skin, to assist firefighting, and to detect the overheating of electrical components.

Military and civilian applications include target acquisition, surveillance, night vision, homing, and tracking. Humans at normal body temperature radiate chiefly at wavelengths around 10 μm (micrometers). Non-military uses include thermal efficiency analysis, environmental monitoring, industrial facility inspections, detection of grow-ops, remote temperature sensing, short-range wireless communication, spectroscopy, and weather forecasting.

Exemples du corpus de texte pour Infrared
1. Far–infrared radiation generators of various uses are being mass–produced by the Far–Infrared Technology Institute in Pyongyang.
2. The one–tonne satellite ASTRO–F is an Infrared Astronomical Satellite (IRAS) that can map the sky at infrared wavelengths.
3. Infrared images Even Hubble‘s keen cameras could not see this galaxy in visible light; it was only detected in infrared images made by Hubble and an infrared camera at the European Southern Observatory in Chile.
4. Then NASA put the Spitzer Infrared Telescope into orbit in 2003 to give astronomers a sharper view of cosmic infrared radiation.
5. It, which generates little near–infrared rays, is a means for irradiating far–infrared rays of wavelengths best matchable to human body with high directiveness and emissivity.