Definition of infrared in English:

infrared

adjective

  • 1(of electromagnetic radiation) having a wavelength just greater than that of the red end of the visible light spectrum but less than that of microwaves. Infrared radiation has a wavelength from about 800 nm to 1 mm, and is emitted particularly by heated objects.

    • ‘The laser will use infrared light with a wavelength of 1.06 microns, which is thousands of times shorter than radio waves.’
    • ‘Viewing the visible and infrared light emitted by galaxies is crucial for determining their mass.’
    • ‘At the heart of the sensor is a liquid-nitrogen-cooled laser diode, which generates infrared light at the same wavelength as a molecular transition in ethane.’
    • ‘It measures the infrared radiation they emit in 167 different wavelengths, providing information about the targets' composition.’
    • ‘Stars like our Sun emit primarily in the visible region, and cooler objects like planets emit invisible infrared radiation.’
    • ‘The materials and the thickness of the layer determine how much infrared radiation and visible light pass through the window.’
    • ‘This dominates their infrared spectra, where wavelengths beyond 0.75 m are efficiently reflected away.’
    • ‘This multi-channel infrared radiometer will measure a wide range of infrared light emitted by the atmosphere at several altitudes.’
    • ‘They zapped the clusters with infrared light and microwaves to make the molecules vibrate and spin.’
    • ‘The photocathode in the night scope that converts visible light into electrons is sensitive to both visible light and some infrared radiation.’
    • ‘Combining the data sets produced a single spectrum spanning visible and infrared wavelengths.’
    • ‘Tinted and mirrored films reduce the quantity of both visible light and infrared radiation entering the occupied space.’
    • ‘The sight does not emit visible or infrared light (except from the eyepiece) that can be detected by the enemy.’
    • ‘The molecules emit infrared light because they have absorbed ultraviolet radiation from the star or have been heated by the wind from the star.’
    • ‘It isn't hot enough to radiate UV rays but it does radiate in the visible and infrared parts of the electromagnetic spectrum.’
    • ‘Terahertz light is a little-studied realm of the electromagnetic spectrum between microwave and infrared light.’
    • ‘Sunlight contains a range of electromagnetic radiation, mostly infrared and visible, but it is the UV radiation that is important from a biological point of view.’
    • ‘‘Each mineral has sort of a fingerprint in the visible to near infrared spectrum,’ explained Johnson.’
    • ‘On the other hand, even tenuous cirrus clouds absorb significant amounts of thermal infrared radiation emitted by the ground and the lower atmosphere.’
    • ‘To cool a room, use fluorescent lights that don't emit infrared rays rather than using incandescent lights.’
    1. 1.1 (of equipment or techniques) using or concerned with this radiation.
      ‘infrared cameras’
      • ‘Investigators seemed baffled by the theft, as guards patrol the premises at night and there is tight security inside, including infrared systems and cameras.’
      • ‘Our second piece of equipment was an infrared thermal camera, which shows differences in temperature across the surface of an animal as a false-color image.’
      • ‘That is to say, with a set of infrared communication equipment, one can easily link a mobile phone to the Internet and freely download anything needed.’
      • ‘But if that storm clears in time, the jets were going to get out with some infrared equipment and help with the search starting tomorrow.’
      • ‘Ball lightning is a phenomenon that has been reported from naked eye sightings, not by people wearing or using infrared imaging equipment.’
      • ‘The lights were filmed March 5 by pilots using infrared equipment.’
      • ‘It was decided previously infrared viewing equipment would be best.’
      • ‘Over a fortnight they used an infrared camera to check the switchgear equipment, which helps power the 1,132 ft long ship.’
      • ‘In recent months, new surveillance equipment and infrared cameras have been installed.’
      • ‘A dozen Army Technical Officers using high speed boats swooped on the Island and made a thorough search of the area using sophisticated infrared equipment.’
      • ‘Just this week, infrared cameras detected 15 people wending across the desert.’
      • ‘The unit's projector head, which incorporates a near - infrared camera, makes a real-time video image of the patient's blood and projects it back onto the patient's skin.’
      • ‘The aircraft was equipped with an infrared video camera and operated from the control tower at the Sentani Air Base near Jayapura.’
      • ‘The commission has now set up an infrared camera in the Dumfries roost so that the bats' behaviour can be observed from below.’
      • ‘He runs a company that makes infrared cameras and he hopes to do experiments while onboard the space station.’
      • ‘A Western team filmed him with infrared cameras and, of course, were able to show that he was performing a conjuring trick.’
      • ‘The grizzly bear cubs inhabiting the refuge atop Grouse Mountain are sleeping under the watchful eye of two infrared cameras.’
      • ‘It's so valuable that it's crowded out older, perfectly reasonable techniques like infrared spectroscopy.’
      • ‘Auditors from utilities may or may not use special equipment such as blower doors and infrared cameras, and they may or may not check the performance of your heating system.’
      • ‘He or she will use a variety of equipment such as blower doors, infrared cameras, and surface thermometers to find inefficiencies that cannot be detected by a visual inspection.’

noun

  • The infrared region of the spectrum; infrared radiation.

    • ‘The detector range of the array spectrometer is 200 to 875 nm, from ultraviolet into the near infrared.’
    • ‘They made observations in four spectrum bands, from the visible through to the near infrared.’
    • ‘The most modern missiles are not fooled by the flares, which is why the more expensive laser and infrared based systems are preferred.’
    • ‘Wavelengths of light in this region of the spectrum cause heating so blocking infrared reduces unwanted rays from the sun.’
    • ‘However although his solution matches experimental observations closely for small values of the wavelength, it was shown to break down in the far infrared by Rubens and Kurlbaum.’
    • ‘Better still might be a camera that sees in the thermal infrared.’
    • ‘The intensity of radiated light diminishes in the extreme ultraviolet and far infrared.’
    • ‘How does this jive with your saying it was only infrared?’
    • ‘But what is so special about water that makes its absorptions extend all the way from the far infrared to the near ultraviolet?’
    • ‘Unlike infrared, you are not limited by line of sight.’
    • ‘Such methods include flight-call monitoring, radio telemetry, passive infrared, and radar.’
    • ‘By mid-century, inroads were also being made into the near infrared.’
    • ‘He turned to the man outside who was watching the monitors of the woman that included infrared of her body temperature and sophisticated machinery that could detect the hint of a lie.’
    • ‘We now have eight sets of mirrors that cover the vibrational infrared from 2 to 11m.’
    • ‘But he said they are the most detailed ever made in UV and infrared, providing data that will be chewed on for some time.’
    • ‘There are of course lasers with wavelengths in the infrared, masers that emit coherent microwaves, and even x-ray lasers.’
    • ‘She claims there shouldn't be too much infrared around in the room (it's a large, fairly cool room, at night, cut into the side of a hill).’
    • ‘But the very same atmosphere is opaque in most frequencies of far infrared, ultraviolet, x-rays and gamma rays.’
    • ‘To warm the soil early in the season, mulch with black or infrared - transmitting plastic.’
    • ‘To obtain this measurement, the researchers use a combination of ultrasound and infrared.’

Pronunciation:

infrared

/ˌinfrəˈred/