Infrared radiation in the spectral distribution of a black body is usually considered a form of heat, since it has an equivalent temperature, and is associated with an entropy change per unit of thermal energy.

Infrared ( IR ) light is electromagnetic radiation with longer wavelengths than those of visible light, extending from the nominal red edge of the visible spectrum at 0. 74 micrometres ( µm ) to 300 µm.

Infrared sensing in snakes depends on a kind of natural thermal imaging, in which tiny packets of cellular water are raised in temperature by the infrared radiation.

Infrared ( IR ) light is electromagnetic radiation with a wavelength between 0. 7 and 300 micrometers, which equates to a frequency range between approximately 1 and 430 THz.

Infrared or red radiation from a common household radiator or electric heater is an example of thermal radiation, as is the heat and light ( IR and visible EM waves ) emitted by a glowing incandescent light bulb.

The Infrared Astronomical Satellite ( IRAS ) discovered an excess of infrared radiation coming from the star, and this was attributed to energy emitted by the orbiting dust as it was heated by the star.

Infrared astronomy is the branch of astronomy and astrophysics that studies astronomical objects visible in infrared ( IR ) radiation.

Infrared falls in between visible radiation, which ranges from 380 to 750 nanometers, and submillimeter waves.

Infrared radiation with wavelengths just longer than visible light, known as near-infrared, behaves in a very similar way to visible light, and can be detected using similar solid state devices.

* Infrared and radiation pyrometers

Infrared radiation from a specific range of wavelengths strikes the vanadium oxide and changes its electrical resistance.

* Infrared, a portion of the electromagnetic radiation spectrum

Infrared energy is just one part of the electromagnetic spectrum, which encompasses radiation from gamma rays, x-rays, ultra violet, a thin region of visible light, infrared, terahertz waves, microwaves, and radio waves.

* Infrared astronomy studies radiation with a wavelength that is too long to be visible to the naked eye but is shorter than radio waves.

Such cameras are often tuned for non-visible radiation for Infrared photography ( for night vision and heat sensing ) or X-ray ( for medical and video astronomy use ).

* Infrared astronomy deals with the detection and analysis of infrared radiation ( this typically refers to wavelengths longer than the detection limit of silicon solid-state detectors, about 1 μm wavelength ).

* Near Infrared, infrared radiation of a wavelength near that of red

Infrared homing refers to a passive missile guidance system which uses the emission from a target of electromagnetic radiation in the infrared part of the spectrum to track it.

; HIFI ( Heterodyne Instrument for the Far Infrared ): A heterodyne detector which is able to electronically separate radiation of different wavelengths, giving a spectral resolution as high as R = 10 < sup > 7 </ sup >.

Infrared homing refers to a passive missile guidance system which uses the emission from a target of electromagnetic radiation in the infrared part of the spectrum to track and follow it.

* Infrared vision, a capability of detecting infrared radiation

Infrared radiation with wavelengths between 7. 5-14 μm strikes the detector material, heating it, and thus changing its electrical resistance.

* Infrared radiation does not travel through common glass windows and therefore microbolometers can not be used to produce images if they are behind a standard glass window and objects and details behind glass cannot be seen.

The Spitzer Science Center ( SSC ), part of the Infrared Processing and Analysis Center located on the Caltech campus, is the data analysis and community support center for NASA's Spitzer Space Telescope.

Infrared is also used to observe distant, red-shifted galaxies that were formed much earlier in the history of the universe.

Infrared light is emitted or absorbed by molecules when they change their rotational-vibrational movements.

Infrared light is used in industrial, scientific, and medical applications.

Infrared spectroscopy ( IR spectroscopy ) is the spectroscopy that deals with the infrared region of the electromagnetic spectrum, that is light with a longer wavelength and lower frequency than visible light.

Infrared in general is used, for instance, in TV remotes.

Infrared technology is low-cost and has the advantage of being allowed aboard.

The high data speeds of UMTS are now most often utilised for Internet access: experience in Japan and elsewhere has shown that user demand for video calls is not high, and telco-provided audio / video content has declined in popularity in favour of high-speed access to the World Wide Web — either directly on a handset or connected to a computer via Wi-Fi, Bluetooth, Infrared or USB.

Infrared light is strongly absorbed by the hydrogen-oxygen or OH bonds.

The organisation is mission center for several key current missions ( Kepler Mission, the Lunar CRater Observation and Sensing Satellite ( LCROSS ) mission, Stratospheric Observatory for Infrared Astronomy ( SOFIA )) and a major contributor to the '" new exploration focus '" as a participant in the Orion crew exploration vehicle and Ares I crew launch vehicle projects.

Stratospheric Observatory for Infrared Astronomy ( SOFIA ) is a joint venture of the U. S. and German aerospace agencies, NASA and the DLR to make an infrared telescope platform that can fly at altitudes high enough to be in the infrared-transparent regime above the water vapor in the Earth's atmosphere.

Infrared light is absorbed at many wavelengths by water vapor in the Earth's atmosphere, so most infrared telescopes are at high elevations in dry places, above as much of the atmosphere as possible.

The Kuiper Airborne Observatory and the Stratospheric Observatory for Infrared Astronomy use airplanes to observe in the infrared, which is absorbed by water vapor in the atmosphere.

This dependence on the polarizability differs from Infrared spectroscopy where the interaction between the molecule and light is determined by the dipole moment ; this contrasting feature allows to analyze transitions that might not be IR active via Raman spectroscopy, as exemplified by the rule of mutual exclusion in centrosymmetric molecules.

Infrared Data Association ( IrDA ) technology is a very simple form of free-space optical communications.

The Infrared Data Association ( IrDA ) is an industry driven interest group that was founded in 1993 by around 50 companies.

Satellite measurements made in 1999 with the Wide Field Infrared Explorer showed that the brightness of Altair fluctuates slightly, varying by less than a thousandth of a magnitude.

The Infrared Interferometer Spectrometer ( IRIS ) team was led by Dr. Rudolf A. Hanel from NASA Goddard Spaceflight Center ( GSFC ).

The Infrared Radiometer ( IRR ) team was led by Professor Gerald Neugebauer from the California Institute of Technology ( Caltech ).

Note: A paper written by Col. Andrew Milani ( Former commander of the 160th Special Operations Aviation Regiment ) and Dr. Stephen D. Biddle entitled " Pitfalls of Technology: A Case Study of the battle of Takur Ghar " noted that the Predator was on station 90 minutes after Roberts had fallen ; the images that were shot before the Predator had arrived were shot by GRIM-32's Infrared Cameras.

In some areas, emergency responders are provided with specialized equipment, such as an Mobile Infrared Transmitter, which allows emergency response vehicles, particularly fire fighting apparatus, to have high-priority travel by having the lights along their route change to green.

Infrared astronomy began in the 1830s, a few decades after the discovery of infrared light by William Herschel in 1800.

A picture of the Jupiter 2009 impact event blemish captured by the Keck II telescope and its NASA Infrared Telescope Facility | near-infrared camera at Mauna Kea Observatory, on July 20.

However, that possibility was ruled out by the Wide-field Infrared Survey Explorer in 2011.

* Search for Artificial Stellar Sources of Infrared Radiation, by Freeman J. Dyson

The prospect of using the Wide-field Infrared Survey Explorer was proposed by NASA officials.

Most of the time is used by the UKIRT Infrared Deep Sky Survey, but some 60 + nights per year are used by Korean institutes.