Gourt > Arts > Photography > Techniques and Styles > Infrared (1)
Infrared (IR) radiation is electromagnetic radiation of a wavelength longer than that of visible light, but shorter than that of radio waves. The name means "below red" (from the Latin infra, "below"), red being the color of visible light of longest wavelength. Infrared radiation spans three orders of magnitude and has wavelengths between approximately 750 nm and 1 mm.
Different regions in the infrared
IR is often subdivided into:- near infrared (NIR, IR-A DIN), 0.75–1.4 µm in wavelength, defined by the water absorption, and commonly used in fiber optic telecommunication because of low attenuation losses in the SiO2 glass (silica) medium.
- short wavelength (shortwave) IR (SWIR, IR-B DIN), 1.4–3 µm, water absorption increases significantly at 1450 nm
- mid wavelength IR (MWIR, IR-C DIN), also intermediate-IR (IIR), 3–8 µm
- long wavelength IR (LWIR, IR-C DIN), 8–15 µm)
- far infrared (FIR, 15–1,000 µm) (see also far infrared laser)
Infrared radiation is popularly known as "heat" or perhaps "heat radiation," since many physics teachers traditionally attribute all radiant heating to infrared light. This is wrong, and is a very widespread misconception. Light or electromagnetic waves of any frequency will heat surfaces which absorb it. IR light from the sun only accounts for 50% of the heating of the Earth, the rest is caused by visible light. Green lasers can char paper, incandescently hot objects put out visible radiation, and ice cubes emit mostly microwaves. However, it is true that objects at room temperature will emit radiation mostly concentrated in the mid-infrared band (see black body). The common nomenclature is justified by the different human response to this radiation: near infrared is the region closest in wavelength to the radiation detectable by the human eye, mid and far infrared are progressively further from the visible regime. Other definitions follow different physical mechanisms (emission peaks, vs. bands, water absorption) and the newest follow technical reasons (The common silicon detectors are sensitive to about 1,050 nm, while InGaAs sensitivity starts around 950 nm and ends between 1,700 and 2,600 nm, depending on the specific configuration). Unfortunately the international standards for these specifications are not currently available.
More on [ Infrared ]
Brother got an infrared fish finder. Tries it out. None of us are fish.
kobunheat (Chris Kohler) Fri, 25 Dec 2009 15:48:24 -0000
Brother got an infrared fish finder. Tries it out. None of us are fish.
EPA:Infrared Remote Sensing Technology Applied as Alert to Monitor the Air ... - Earthtimes (press release) http://twa.lk/NiBwn
health23 (socialmedia) Fri, 25 Dec 2009 15:45:13 -0000
EPA:Infrared Remote Sensing Technology Applied as Alert to Monitor the Air ... - Earthtimes (press release) http://twa.lk/NiBwn
LifeSmart 2 Person Infrared Sauna Featuring Carbon Heaters and Stereo System http://bit.ly/8MVzmp
baiboa (Kulis Sara) Fri, 25 Dec 2009 15:39:05 -0000
LifeSmart 2 Person Infrared Sauna Featuring Carbon Heaters and Stereo System http://bit.ly/8MVzmp
reading safety rules 4 new webcam. apparently, one should not point an infrared beam into the eye. i guess i learned something new today. :)
beccaaleee38 (Becca Lee) Fri, 25 Dec 2009 15:32:02 -0000
reading safety rules 4 new webcam. apparently, one should not point an infrared beam into the eye. i guess i learned something new today. :)
Business Industry Digital Non Contact Infrared IR Thermometer 716F ST380 - Sai.. http://bit.ly/6CHuHG #ebay #industry
closing_bid (Closing Bid) Fri, 25 Dec 2009 15:24:09 -0000
Business Industry Digital Non Contact Infrared IR Thermometer 716F ST380 - Sai.. http://bit.ly/6CHuHG #ebay #industry
HandHelditems: 3 Channel Hawk Talon 6 Inches Infrared RC Helicopter (By Team RC) For $17.99 with coupon "rcteamhawk" http://is.gd/5oWHD
el_cheepo (El Cheapo) Fri, 25 Dec 2009 15:23:06 -0000
HandHelditems: 3 Channel Hawk Talon 6 Inches Infrared RC Helicopter (By Team RC) For $17.99 with coupon "rcteamhawk" http://is.gd/5oWHD
Andrew Davidhazy - Infrared Photography Examples - Low to high tech and all in between. He writes on a wide variety of articles on all things photographic. And, teaches at, arguably, the best photography school in the US. Not for the beginner.
Meta Description: [ Infrared photography for aesthetic purposes
is widespread and pervasive in the world of photography. In these several
examples some of the more unusual applications of IR imaging are illustrated.
]
Experiments with Digital Infrared Photography - How to do black and white, and false-color infrared photography using a digital still camera and an image-editing program.
Meta Description: [ A relatively novel technique for black
and white and colour infrared photography with digital still cameras ]
Infrared Photography FAQ - Information on film, filters, cameras, developing, techniques, and lenses. Direct links to the Infrared mailing list and other sites with infrared images and information.
Meta Description: [ CoCam: infrared FAQ containing information on infrared filters, infrared films, infrared film development information, infrared light, infrared exposure times, cameras, SLRs, rangefinders, and infrared books ]
Infrared Photography of Jaap Los - All you want to know about infrared photography. Information, links, and sample images.
Meta Description: [ All you want to know about Infrared Photography ]
Infrared Stuff I Use - Marco Pauck provides information on making infrared pictures. Also a section on digital infrared photography.
Meta Description: [ The stuff Marco Pauck uses for taking infrared pictures ]
Invisible Light - Infrared photography site featuring the work of Andy Finney. The site also includes a bibliography, links to other sites, and technical information on infrared imaging, including journal and patent abstracts.
Meta Description: [ Invisible Light - Infrared Photography Gallery with a collection of images by Andy Finney, a guide to the technology involved, a bibliography and links to related sites. ]
Jeffholbrook - Black and white infrared images of spooky graveyards and surreal landscapes.
Kodak: High Speed Infrared Film - Datasheet on Kodak High Speed Infrared film.
Processing Infrared Film - Technical information on Kodak Ektachrome Professional Infrared EIR film.
Spearmint Guide to Infrared Photography - A rough guide to infrared photography, including filter comparisons and exposure techniques
Meta Description: [ Spearmints guide to infrared photography ]
WJ's Infrared Photography - Information on infrared photography, filters, fisheyes, tilt/shift lenses, panoramic cameras, and microscopic lenses.
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