Infrared
hideInfrared (IR) radiation is electromagnetic radiation whose wavelength is longer than that of visible light (400-700 nm), but shorter than that of terahertz radiation (100 µm - 1 mm) and microwaves (~30,000 µm). Infrared radiation spans roughly three orders of magnitude (750 nm and 100 µm).
Direct sunlight has a luminous efficacy of about 93 lumens per watt of radiant flux, which includes infrared (47% share of the spectrum), visible (46%), and ultra-violet (only 6%) light. Bright sunlight provides luminance of approximately 100,000 candela per square meter at the Earth's surface.
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News tagged with infrared light
Astronomers explore 'last blank space' on map of the Universe
Oct 28, 2009 |
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(PhysOrg.com) -- The most distant object ever discovered is described in this week's edition of the science journal Nature. Two international teams of astronomers report their observations of a gamma-ray burst ...
IMEC unveils promising mechanically-stacked GaAs/Ge multijunction solar cell
Sep 22, 2009 |
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At the European Photovoltaic Solar Energy Conference (Hamburg, Germany), IMEC presents a mechanically-stacked GaAs/Ge multijunction solar cell. This is the first promising demonstrator of IMEC’s novel technology ...
In brief: A tiny, tunable well of light, and a string theorist's toolbox
Sep 21, 2009 |
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Promising photonic devices, and theorists attempt to determine whether particle physics and string theory can be reconciled.
Hitachi develops a 3mm thin-type finger vein authentication module
Sep 02, 2009 |
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Hitachi, Ltd. today announced the development of a 3mm thick thin-type finger vein authentication module. Finger vein authentication is a biometric identification technology which employs near infrared light ...
NASA's Spitzer Images Out-of-This-World Galaxy
Jul 23, 2009 |
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(PhysOrg.com) -- NASA's Spitzer Space Telescope has imaged a wild creature of the dark -- a coiled galaxy with an eye-like object at its center.
If Spitzer Could Talk: An Interview with NASA's Coolest Space Telescope
Space & Earth / Space Exploration
May 05, 2009 |
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NASA's Spitzer Space Telescope is about to use its last drop of the coolant that has chilled it for the past five-and-a-half years. On about May 12, give or take a week or so, the observatory is predicted ...
Star Trek-like technology offers noninvasive monitor for patients and athletes
Apr 29, 2009 |
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How long will it take to develop Star Trek-like medical technologies? The gap between science fiction and reality is closing faster than many people may think.
Light-activated 'lock' can control blood clotting, drug delivery
Mar 30, 2009 |
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Scientists have shed new light -- literally -- on a possible way to starve cancer tumors or prevent side effects from a wide range of drugs.
Hollow gold nanospheres show promise for biomedical and other applications
Nanotechnology / Bio & Medicine
Mar 22, 2009 |
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(PhysOrg.com) -- A new metal nanostructure developed by researchers at the University of California, Santa Cruz, has already shown promise in cancer therapy studies and could be used for chemical and biological ...
Study on free-space optical communication shows experimental evidence of a unique atmospheric effect
Mar 17, 2009 |
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Three members of the faculty at Stevens Institute of Technology recently collaborated on a paper focusing on free-space optical communication, which appears in the latest issue of Optics Express.
Galaxy Cores to Crash in a Few Million Years
Mar 16, 2009 |
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(PhysOrg.com) -- A new image from NASA's Spitzer Space Telescope offers a rare view of an imminent collision between the cores of two merging galaxies, each powered by a black hole with millions of times the ...
Infrared Nanotube Films Offer Advantages for Solar Cells and More
Mar 11, 2009 |
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(PhysOrg.com) -- Researchers have already known that carbon nanotube thin films have mechanical and conductive advantages that could make them useful as electrodes in solar cells, solid state lighting, and ...
Watching Venus glow in the dark
Space & Earth / Space Exploration
Feb 24, 2009 |
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(PhysOrg.com) -- ESA’s Venus Express spacecraft has observed an eerie glow in the night-time atmosphere of Venus. This infrared light comes from nitric oxide and is showing scientists that the atmosphere of ...
Quantum dots as midinfrared emitters
Feb 23, 2009 |
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(PhysOrg.com) -- “People are interested in the mid-infrared,” Dan Wasserman tells PhysOrg.com. Infrared light has a wavelength longer than visible light, and many molecules have numerous very strong optical resonances in the ...
Glowing 'Cornell dots' can show surgeons where tumors are
Nanotechnology / Bio & Medicine
Feb 19, 2009 |
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(PhysOrg.com) -- Brightly glowing nanoparticles known as "Cornell dots" are a safe, effective way to "light up" cancerous tumors so surgeons can find and remove them.
