An infrareddetector is a photodetector that reacts to infrared IR radiation . The two main types of detectors are thermal and photonic. The thermal effects of the incident IR radiation can be followed through many temperature dependent phenomena. Bolometer s and microbolometer s are based on changes in resistance. Thermocouple s and thermopile s use the thermoelectric effect . Golay cells follow thermal expansion. In IR spectrometer s the pyroelectric detector s are the most widespread. The response time and sensitivity of photonic detectors can be much higher, but usually these have to be cooled to cut thermal noise . The materials in these are semiconductors with narrow band gaps. Incident IR photons can cause electronic excitations. In photoconductive detectors, the resistivity of the detector element is monitored. Photovoltaic detectors contain a p n junction on which photoelectric current appears upon illumination. A few detector materials Types type Spectral range m Indium gallium arsenide InGaAs photodiode 0.7 2.6 Germanium photodiode 0.8 1.7 Lead sulfide PbS photoconductive 1 3.2 Lead selenide PbSe photoconductive 1.5 5.2 Indium antimonide InSb photoconductive 1 6.7 Indium arsenide InAs photovoltaic 1 3.8 Platinum silicide PtSi photovoltaic 1 5 Indium antimonide InSb photodiode 1 5.5 Mercury cadmium telluride MCT, HgCdTe photoconductive 0.8 25 Mercury zinc telluride MZT, HgZnTe photoconductive Lithium tantalate LiTaO sub 3 sub pyroelectric triglycine sulfate TGS and DTGS pyroelectric The range of pyroelectric detector is determined by the window materials used in their construction. Vanadium pentoxide is frequently used as a detector material in uncooled microbolometer ... of infrared detectors.pdf Characteristics and Use of Infrared Detectors Hamamatsu Photonics http ... Variety of Infrared Detectors Hamamatsu Photonics Category Detectors Category Image sensors Category Infrared imaging ko it Rivelatore ad infrarossi he ... more details
Unreferenced date December 2009 The SPRITE infrareddetector is named after the process of signal integration carried out by Signal Processing In The Element . The technique was invented at the Royal Signals and Radar Establishment at Malvern, Worcestershire Malvern by a team of scientists including C. Thomas Elliott Tom Elliott . The detector allows the build up of detected infrared signal in a Cadmium Mercury Telluride photoconductor strip CMT by applying a bias current through the strip. The detector is used in a scanned thermal imager and the bias voltage is adjusted to force electron s produced by the detected energy at one end of the strip to drift to the far end of the strip in time with the rate of the scanning such that energy from the same response is built up along the full length of the strip. This allows a much simpler way of integrating responses than linking separate detector cells. This type of detector was used in a series of thermal imaging thermal imagers known as TICM thermal imaging common modules . These modules were the mainstay of UK forces thermal imagers from the 1980s until their replacement by fully staring, two dimensional arrays detectors. DEFAULTSORT Sprite InfraredDetector Category Infrared imaging ... more details
versus fixed point detectors An open path detector usually costs more than a Infrared point sensor single point detector , so there is little incentive for applications that play to a point detector s strengths where the point detector can be placed at the known location of the highest gas concentration, and a relatively slow response is acceptable. The open path detector excels in outdoor situations ..., the infrared signal strengths are measured by some form of infrareddetector . Generally photodiode ...Infrared open path gas detectors send out a beam of infrared light, detecting gas anywhere along the path .... Open path detectors can be contrasted with Infrared point sensor s. They are widely used in the petroleum ... absorption of a suitable infrared wavelength in the beam. Rain, fog etc. in the measurement path ... units of measurement for a Infrared point sensor are parts per million ppm or the percentage of the lower flammable limit LFL , the natural units of measurement for an open path detector are ppm.metres ... will one detector replace several, but the costs of installation, maintenance, cabling etc. are likely ..., where a detector appears to be working but is insensitive to gas, is especially serious. For instance ... of the infrared type are immune from the former but not the latter mechanism. Open path detectors ... is easily made to generate a beam block signal, distinct from zero gas or a hardware fault. Infrared .... The possibility of revealed downtime of an open path detector due to fog can be minimised by limiting ... of much greater distances in clear air. Component parts In principle any source of infrared radiation ... spectral power of direct sunlight in the infrared, especially when pulsed. Modern open path ... from the broad infrared spectrum. In principle any conventional spectrometer technique is possible, but the Nondispersive infrared sensor NDIR technique with Optical coating multilayer dielectric ..., and sometimes configurable by the user. Operating Wavelengths The choice of infrared wavelengths ... more details
in mid infrared thermal light false color Infrared IR light is electromagnetic radiation with a wavelength ... when they change their Infrared spectroscopy rotational vibrational movements. Sunlight at zenith ..., 527 watts is infrared radiation, 445 watts is visible light , and 32 watts is ultraviolet ... by .jpg thumb Beta Pictoris as seen in infrared. Infrared imaging is used extensively for military ... sensing, short ranged wireless communication , spectroscopy , and weather forecasting . Infrared ... title IR Astronomy Overview publisher NASA Infrared Astronomy and Processing Center accessdate ... micrometers , as shown by Wien s displacement law . At the atom ic level, infrared energy elicits vibration .... Infrared spectroscopy examines absorption and transmission of photon s in the infrared energy range ... www.cem.msu.edu reusch VirtualText Spectrpy InfraRed infrared.htm title Infrared Spectroscopy publisher ..., the Latin infra meaning below . Red is the color of the longest wavelengths of visible light. Infrared ..., hence the literal meaning of below red. Different regions in the infrared Refimprove section date July 2006 Objects generally emit infrared radiation across a spectrum of wavelengths, but sometimes ... within a specific bandwidth. Therefore, the infrared band is often subdivided into smaller sections. CIE division scheme The International Commission on Illumination CIE recommended the division of infrared ... publisher Springer year 2009 pages 21 22 isbn 9781402092527 ref Near infrared NIR, IR A DIN 0.75 1.4 ... vision goggles. Short wavelength infrared SWIR, IR B DIN 1.4 3 m, water absorption increases ... for long distance telecommunications. Mid wavelength infrared MWIR, IR C DIN also called intermediate infrared IIR 3 8 m. In guided missile technology the 3 5 m portion of this band ... to work, homing on to the Infrared signature of the target aircraft, typically the jet engine exhaust plume. Long wavelength infrared LWIR, IR C DIN 8 15 m. This is the thermal imaging region, in which ... more details
File WyomingInfraRedObservatory.jpg thumb right 200px Wyoming Infrared Observatory WIRO is a ground based infrared telescope, at high elevation File SOFIA with open telescope doors.jpg thumb right 200px SOFIA is an infrared telescope in an aircraft, allowing high altitude observations An infrared telescope is a telescope that uses infrared light to detect celestial bodies. Infrared light is one of several ... of these are gamma ray, x ray, ultra violet, regular visible light optical , as well as infrared telescopes. Discoveries Leading to the Invention of the Infrared Telescope In 1800, William Herschel discovered infrared radiation. In 1878, Samuel Pierpoint Langley created the first bolometer. This was a very ... in the infrared spectrum. In the 1950 s, scientists used lead sulfide detectors to detect the infrared ..., Harold Johnson created near infrared photometers which allowed scientists to measure thousands of stars ..., led the way for current infrared telescope development. http www.ipac.caltech.edu Outreach Edu Timeline timeline2.html The three different types of infrared telescopes are ground based telescopes, air borne telescopes, and space telescopes. All three types of telescopes contain an infrared camera that must be cooled to hundreds of degrees below zero as well as a special solid state infrareddetector. http coolcosmos.ipac.caltech.edu cosmic classroom ask astronomer faq obs.shtml Ground based telescopes were the first type of infrared telescopes to be used to observe outer space. Their popularity ... s atmosphere absorbs infrared radiation. Ground based infrared telescopes tend to be placed ... balloons to lift infrared telescopes to higher altitudes. With balloons, they were able to reach about 25 miles up. In 1967, infrared telescopes were placed on rockets. http www.ipac.caltech.edu Outreach Edu Timeline timeline2.html These were the first air borne infrared telescopes. A more recent air borne infrared telescope to reach the stratosphere was NASA s Stratospheric Observatory for Infrared ... more details
of the atmospheric transmittance windows, i.e. the wavelengths regions in which infrared radiation is better transmitted through the atmosphere, the detector materials used to build the infrared ... remote sensing using a combinations of detector materials. The Medium Wavelength Infrared MWIR and the Long ...Infrared vision can be defined as the capability of biological or artificial systems to detect infrared ... in this context since infrared emissions from a body are directly related to their temperature hotter objects emit more energy in the infrared spectrum than colder ones. The human body, as well as many ... environment. Since hotter objects emit more infrared energy than colder ones, it is relatively easy to identify them with an infrareddetector , day or night. Hence, the term night vision is also used sometimes misused in the place of infrared vision , since one of the original purposes in developing ... . ref However, night vision concerns the ability to see in the dark although not necessarily in the infrared ... HowStuffWorks . ref light intensifiers or infrared vision. The former technology uses a photocathode to convert light in the visible or near infrared portions of the electromagnetic spectrum to electrons, amplify the signal and transform it back to photons. Infrared vision on the other hand, uses an infrareddetector working at mid or long wavelengths invisible to the human eye to capture the heat emitted by an object. The infrared spectrum Image Infrared spectrum.gif thumb right 400px The infrared bands in the electromagnetic spectrum. The entire electromagnetic spectrum highlighting the infrared ... from one author to another, ref Hudson R. D. 1969, Infrared System Engineering , John Wiley & Sons Inc., USA. ref ref Piotrowski J. and Rogalski A. 2004, Uncooled Long Wavelength Infrared Photon Detectors , Infrared Phys. Technol., 46 115 131. ref ,. ref Rogalski A. and Chrzanowski K. 2002, Infrared .... 2004, Infrared Imaging and Open Heart Surgery, from InfraredThermography.com by Advanced Infrared ... more details
cross section InfrareddetectorInfrared countermeasures Survivability DEFAULTSORT Infrared Signature ...The term infrared signature is used by Military science defense scientists and the military to describe the appearance of objects to infrared sensors . An infrared signature depends on many factors, including ... estimation of solid angle subtended by complex well resolved surfaces for infrared detection ..., Gaitonde, U.N., & Marathe A.G. 2001 Numerical studies of infrared signature levels of complete aircraft ..., & Rao, G.A. 2009 Study of sunshine, skyshine, and earthshine for aircraft infrared detection, Journal ... infrared signatures , AIAA Journal of Aircraft , v. 42 4 , pp. 1046 1054. ref and the waveband of the detecting sensor. As such there is no all encompassing definition of infrared signature nor any trivial means of measuring it. For example the infrared signature of a truck viewed against a field will vary significantly with changing weather, time of day and engine loading. Infrared stealth is an area of stealth technology aimed at reducing infrared signatures. ref Mahulikar, S.P., Sonawane, H.R., & Rao, G.A. 2007 Infrared signature studies of aerospace vehicles , Progress in Aerospace Sciences , v. 43 7 8 , pp. 218 245. ref This reduces a platform s susceptibility to infrared guided weapons and infrared surveillance sensors, ref Rao, G.A., & Mahulikar, S.P. 2005 New criterion for aircraft susceptibility to infrared homing missiles , Aerospace Science & Technology , v. 9 8 , pp. 701 712. ref and thus increases the platform s overall survivability. Infrared stealth is particularly ..., S.P., Rao, G.A., Sane, S.K., & Marathe, A.G. 2005 Aircraft plume infrared signature in nonafterburning ..., S.K. 2008 Infrared signature suppression of helicopter engine duct based on conceal and camouflage ... soldiers. A military aim in studying infrared signatures is to understand the likely infrared signature of threats and develop the equipment required to detect them and to reduce the infrared ... more details
and 1960s, combined with the improvement of infrareddetector technology, prompted more astronomers ... wavelengths. If infrared detectors were not kept cooled, the radiation from the detector itself would ... One of the most common infrareddetector arrays used at research telescopes is HgCdTe arrays ...File Carina Nebula in infrared light captured by the Hubble Space Telescope .jpg thumb 300px Carina Nebula in infrared light captured by the Hubble Space Telescope Hubble s Wide Field Camera 3. Infrared astronomy is the branch of astronomy and astrophysics that studies astronomical object s visible in infrared IR radiation. The wavelength of infrared light ranges from 0.75 to 300 micrometers. Infrared ... radiation submillimeter waves. Infrared astronomy began in the 1830s, a few decades after the discovery of infrared light by William Herschel in 1800. Early progress was limited, and it was not until ... and Moon were detected in infrared light. After a number of discoveries were made in the 1950s and 1960s ... wavelength range, and modern infrared astronomy was established. Infrared and optical astronomy are often ... effective over a wavelength range that includes both visible and infrared light. Both fields also use ... used are different. Infrared light is absorption electromagnetic radiation absorb ed 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. There are also infrared observatories ... with open telescope doors.jpg thumb right 200px SOFIA is an infrared telescope in an aircraft, shown here in a 2009 test The discovery of infrared radiation is attributed to William Herschel, who ... at infrared wavelengths was due to the spectral index of the prism rather than properties of the Sun ... bio.html title Herschel Discovers Infrared Light accessdate 2010 04 09 ref Efforts were made starting in the 1830s and continuing through the 19th century to detect infrared radiation from other astronomical ... more details
Top tree photographed in the near infrared range. Bottom same tree in the Visible spectrum ... Infrared image of the Mississippi River crossed by a bridge and a dam, between red foliage on left, and blue parking lots and buildings on right In infrared photography , the film or image sensor used is sensitive to infrared light. The part of the visible spectrum spectrum used is referred to as near infrared to distinguish it from far infrared, which is the domain of thermal imaging . Wavelength s used for photography range from about 700 nanometre nm to about 900 nm. Usually an infrared filter is used this lets infrared IR light pass through to the camera , but blocks all or most of the visible ... are used together with infrared sensitive film or sensors, very interesting in camera effect s can ... seen in infrared photographs. The effect is named after the infrared photography pioneer Robert W. Wood , and not after the material wood, which does not strongly reflect infrared. The other attributes of infrared photographs include very dark skies and penetration of atmospheric haze .... The dark skies, in turn, result in less infrared light in shadows and dark reflections of those skies ... 20th century, infrared photography was not possible because silver halide emulsions are not sensitive ... title Chemistry of Photography accessdate 2006 11 28 ref The first infrared photographs as distinct ... Years of Infrared author volume 148 issue 10 publisher Royal Photographic Society pages 571 date Dec ... thus, most of his work focused on landscapes. A further set of infrared landscapes taken by Wood ... a few infrared photographs in Portugal in 1910, which are now in the Kodak archives. Infrared sensitive ... analysis, and infrared sensitizing dyes were investigated for improved haze penetration in aerial photography. ref http books.google.com books?id Y1GLcdK98HwC&pg PA114&dq infrared plates&lr &as drrb is b&as ...&cd 5 v onepage&q infrared 20plates&f false Annual Report of the Director Bureau of Standards to the Secretary ... more details
unreferenced date December 2008 Infrared thermometers infer temperature using a portion of the thermal ... of infrared energy emitted by the object and its emissivity , the object s temperature can be determined ... possibilities. The most basic design consists of a lens to focus the infrared thermal radiation on to a detector , which converts the radiant power to an electrical signal that can be displayed in units ... temperature measurement from a distance without contact with the object to be measured. As such, the infrared ... temperature gradient on the object s surface. Infrared thermometers can be used to serve a wide variety ... and development or manufacturing quality control situations There are many varieties of infrared ... measurement error is acceptable. The most common infrared thermometers are the Spot Infrared Thermometer or Infrared Pyrometer , which measures the temperature at a spot on a surface actually ... thermometers, includes Infrared Scanning Systems scan a larger area, typically by using what is essentially ... and paper, or continuous piles of material along a conveyor belt. Infrared Thermal Imaging Cameras or Thermographic camera Infrared Cameras are essentially infrared radiation thermometers that measure ... using infrared film and suitable lens, etc., is also called an infrared camera . Gallery gallery Image ... A medical IR thermometer in use, with the light indicating the measured area. Image Infrared thermometer.JPG ... http www.landinst.com infrared LAND Infrared Thermometers http www.raytek.com Raytek en r0 IREducation Infrared Principles & Advantages of Using Infrared Thermometers from www.raytek.com http www.infraspection.com ... for Infrared Thermography http www.ukta.org UK Thermography Association http www.omega.com prodinfo infraredthermometer.html Introduction to Infrared Thermometers Omega http www.irapps.com Applications of Infrared Thermometers and Thermal Imagers a free online compilation of applications from various ... since the mid 1990s http www.tempsensor.net Self submission, free database with listings for infrared ... more details
For a table of IR spectroscopy data infrared spectroscopy correlation table Infrared spectroscopy IR spectroscopy is the spectroscopy that deals with the infrared region of the electromagnetic spectrum ... is a Fourier transform infrared spectroscopy Fourier transform infrared FTIR spectrometer . The infrared ... infrared, named for their relation to the visible spectrum. The higher energy near IR, approximately ... mathematics harmonic vibrations. The mid infrared, approximately 4000 400 cm sup 1 sup 2.5 ... vibrational structure. The far infrared, approximately 400 10 wavenumber cm sup 1 sup ... based on the relative molecular or electromagnetic properties. Theory Infrared spectroscopy exploits .... Practical IR spectroscopy The infrared spectrum of a sample is recorded by passing a beam of infrared ... of 5 to 10 cm equipped with infrared windows at the both ends of the tube can be used for concentrations ... with a White cell spectroscopy White s cell in which the infrared light is guided with mirrors to travel ... publisher Wiley Blackwell ref The plates are transparent to the infrared light and do not introduce ... Schematics of a two beam absorption spectrometer. A beam of infrared light is produced, passed ... the sample, the other passed through a reference. The beams are both reflected back towards a detector ... the detector. The two signals are then compared and a printout is obtained. This two beam setup gives accurate spectra even if the intensity of the light source drifts over time. To take the infrared ..., but also the properties of the instrument for example, what light source is used, what detector is used ... the sample. This technique is not perfectly reliable If the infrared lamp is a bit brighter ... of effects to give very accurate results. FTIR Main Fourier transform infrared spectroscopy ... data which can be Fourier transform ed to get the actual spectrum. Fourier transform infrared FTIR spectroscopy is a measurement technique that allows one to record infrared spectra. Infrared light ... more details
Infrared may mean The infrared range of light. Infrared spectroscopy subset of spectroscopy Infrared record label , a UK based record label. Infra red song , a song by the band Placebo band Placebo . Disambig ... more details
false heat targets An infrared countermeasure IRCM is a device designed to protect aircraft from infrared homing heat seeking missiles by confusing the missiles infrared guidance system so that they will miss ... the years to be lighter, more portable, and more reliable, but the basic principle is the same. Infrared missile seeker technology see also Infrared homing Infrared missile seekers of the first generation typically used a spinning reticle with a pattern on it that modulates infrared energy before it falls on a detector A mode of operation called Spin scan . The patterns used differ from seeker to seeker ... the infrared source of energy is relative to the missile direction of flight. In more recent designs ... right thumb A ALQ 144 modulated IRCM jammer. Infrared seekers are designed to track a strong source of infrared radiation usually a jet engine in modern military aircraft . IRCM systems are based on modulated source of infrared radiation with a higher intensity than the target. When this modulated ..., rapidly breaking lock. Once an infrared seeker breaks lock they typically have a field of view ... can cause the confused seeker to lock onto a new infrared source that is rapidly moving away from ... The Infrared & Electro Optical Systems Handbook. Countermeasure Systems, Volume 7 ref Drawbacks of IRCM One of the drawbacks of standard IRCM systems is that they broadcast a bright source of infrared ... DIRCM , or Directional Infrared Countermeasures, avoid this potential drawback by mounting the energy ... Spectral Infrared Countermeasure MUSIC that will similarly use active laser s instead of flare countermeasure ... Countermeasures DoN LAIRCM provides infrared threat protection for U.S. Marine Corps CH 53E, CH ... Grumman to Provide Infrared Missile Warning Systems and Processors to the U.S. Navy for Heavy Lift Helicopter Fleets ref CIRCM Common Infrared Countermeasures File ITT IRCM.jpg thumb ITT s CIRCM ... CIRCM RFI ref Flares Flares create infrared targets with a much stronger signature than the aircraft ... more details
Infrared lamps are electrical devices which emit infrared radiation. Infrared lamps have many uses, but are most commonly used in communication and heating. Infrared Heating main Infrared heater Infrared heating uses infrared lamps to transmit infrared radiation to the body that is being heated. When large bodies or bodies with a large surface area need to be heated, infrared lamps are often used in banks. Infrared heat lamps are commonly incandescent bulbs which are able to produce infrared radiation. Infrared lamps have many industrial applications including curing coatings and preparing plastic for forming, commercial applications such as cooking and browning food, and personal applications such as providing heat especially in bathrooms and for pets . Infrared Communication Image Blue infrared light.jpg thumb 300px right Infrared light from the LED of a remote control as seen by a digital camera. IR data transmission is also employed in short range communication among computer peripherals and personal digital assistant s. These devices usually conform to standards published by Infrared Data Association IrDA , the Infrared Data Association. Remote controls and IrDA devices use infrared light emitting diode s LEDs to emit infrared radiation which is focused by a plastic Lens optics ... . The receiver uses a silicon photodiode to convert the infrared radiation to an electric Current ..., and filters out slowly changing infrared radiation from ambient light. Infrared communications are useful ... not interfere with other devices in adjoining rooms. Infrared is the most common way for remote control s to command appliances. Free space optics Free space optical communication using infrared laser ... at up to 4 gigabit s, compared to the cost of burying fiber optic cable. Infrared lasers are used to provide the light for optical fiber communications systems. Infrared light with a wavelength around ... silica fibers. See also Infrared Applications Infrared communications applications Category ... more details
Unreferenced date February 2008 Mergeto Infrared Data Association date October 2008 An infrared port is a Computer port hardware port that can send and receive data using infrared light, usually using the Infrared Data Association IrDA protocol. Infrared ports were once common on laptop computers, PDA s, and cell phone s, but are being displaced by Radio frequency RF technologies, such as Bluetooth . They are still common in remote controllers of various home and office equipment, such as televisions, DVD players, amplifiers etc. External links http www.netlingo.com word infrared port.php netlingo.com definition. Category Computer peripherals Technology stub cs Infra erven port sk IrDA port ... more details
Infrared cirrus are filamentary structures seen in infrared light. The name is given because the structure looks cloud like in appearance. First detected by the IRAS Infrared Astronomy Satellite at wavelengths of 60 and 100 micrometres. See also Cosmic infrared background radiation External links http arxiv.org abs astro ph 0507587 Molecular Hydrogen in Infrared Cirrus , Kristen Gillmon, J. Michael Shull, 2006 Abstract http arxiv.org pdf astro ph 0507587 PDF Paper http www.sofia.usra.edu Science science cases dowell v2.pdf The Physics of Infrared Cirrus , C. Darren Dowell, Roger H. Hildebrand, Alex Lazarian, Michael W. Werner, Ellen Zweibel DEFAULTSORT Infrared Cirrus Category Interstellar media astronomy stub de Infrarot Cirrus fr Cirrus infrarouge zh ... more details
Refimprove date January 2008 Infrared cleaning is a technique used by some film scanner s and flatbed scanner s to reduce or remove the effect of dust and scratches upon the finished image scanning scan . It works by collecting an additional infrared channel from the scan at the same position and resolution as the three visible colour channels red, green, and blue . This infrared channel can be used to automatically remove the appearance of dust and scratches in the visible channels and replace them by inpainting . Approaches Scanners use three different techniques for doing this Nikon film scanners ... infrared light source. At each scan position, the scanner uses an RGB linear array to scan the film in RGB and RGB Infrared. This is as fast as the Nikon approach, since only one physical pass over ..., an RGB light source and an infrared light source. These scanners make two passes over the film once for RGB and once for infrared. This is slower than the Nikon or Minolta approach, since two passes ... quality. Applicability The three color dyes in modern color film emulsions respond equally to infrared light, so the infrared image looks relatively opaque compared to the RGB image. Any dust spots or scratches appear as dark spots in infrared, making it easy to find and correct for these dust spots. Kodachrome film dyes are more sensitive to infrared than Ektachrome film dyes, making it more ... s ref http www.silverfast.com highlights isrd en.html ref , claim to use infrared cleaning to find dust spots even when scanning Kodachrome. Infrared cleaning doesn t work at all with silver halide ... particles respond equally in visible light and infrared light . History IBM originally developed and patented infrared cleaning, and subsequently licensed this patent to Applied Science Fiction ASF . Canon has a patent cross licensing agreement with IBM and was able to use the IBM s infrared cleaning ... developed infrared cleaning algorithms which are completely different from IBM s patented ... more details
An infrared excess is a measurement of an astronomical source, typically a star , that has a greater measured infrared radiative flux flux than expected by assuming the star is a blackbody radiation blackbody radiator . Infrared excesses are often the result of circumstellar dust and are common in young stellar object s and evolved stars on the asymptotic giant branch or Post AGB older . References cite book last Evans first Aneurin title The Dusty Universe publisher Ellis Horwood date 1993 pages 155 165 Category Observational astronomy astronomy stub de Infrarotexzess sk Infra erven prebytok zh ... more details
An infrared heater is a body with a higher temperature which transfers energy to a body with a lower ... of the infrared radiation ranges from 780 nm to 1 mm. The relationship between ... the two bodies is needed for the energy transfer. A rough classification of infrared heaters is connected to wavelength bands of major emission of the energy short wave or near infrared for the range ... light with glare is emitted medium infrared for the range between 1400 nm and 3000 nm far infrared or dark emitters for everything above 3000 nm. File Carbon heater.jpg thumb right A household infrared electric heater Elements of infrared heaters Infrared heaters use either a fuel to heat an emitter, or an electrically heated Electrical filament filament as the emitting body. An infrared ... light bulb . The most common filament material used for electrical infrared heaters is tungsten ... filament. Industrial infrared heaters sometimes use a gold coating on the Quartz Heating Element quartz tube that reflects the infrared radiation and directs it towards the product to be heated. Consequently the infrared radiation impinging on the product is virtually doubled. Gold is used because of its oxidation resistance and very high IR reflectivity of approximately 95 . Types of infrared heaters Infrared heaters are commonly used in infrared modules or emitter banks combining several heaters to achieve larger heated areas. Infrared heaters are usually classified by the wavelength they emit. Near infrared NIR or short wave infrared heaters operate at high filament temperatures ... wave and carbon CIR infrared heaters operate at filament temperatures of around 1000 C. They reach maximum power densities of up to 60 kW m medium wave and 150 kW m CIR . Far infrared heaters are typically used in low temperature infrared sauna s. Heat lamps A heat lamp is an incandescent ... emitted by the lamp is shifted to produce more infrared light . Many heat lamps include a red ... more details
Infobox Film see Template Infobox film name Infrared Sightings image GDInfraredSightingsVHS.jpg caption Infrared Sightings video tape cover director Len Dell Amico br Larry Lachman producer Len Dell Amico br Larry Lachman music Grateful Dead distributor Trigon Productions released 1992 runtime 18 minutes country United States language English Infrared Sightings is a video by the Grateful Dead , consisting of computer animation and other imagery set to music from their album Infrared Roses . It was released on VHS video tape and on laserdisc in 1992 in film 1992 , and is 18 minutes long. Infrared Roses is known to fans as the all Drums and Space album . Produced by Grateful Dead sound designer Bob Bralove, it contains free form musical improvisation improvisational music recorded live at a number of different Dead concerts. The visuals for Infrared Sightings combine computer generated images, many of them abstract art abstract , with found footage that has been altered or edited in various ways. The video is therefore somewhat reminiscent of the light shows that were projected on large screens at many Grateful Dead concerts. Infrared Sightings on Allmovie The Allmovie entry for Infrared Sightings http allmovie.com cg avg.dll?p avg&sql 1 178339 erroneously states that the video includes the songs Truckin , Playing in the Band , Not Fade Away song Not Fade Away , Sugar Magnolia , and Friend of the Devil . As explained above, the soundtrack of Infrared Sightings actually is made up of sections of different performances of the free form musical improvisation known as Drums and Space ... Highrise Table Top Stomp part 3 Yes I Kandinsky music Infrared Roses Credits Musicians Jerry Garcia ... movie 178339 http www.deaddisc.com vi Infrared.htm Infrared Sightings at the Grateful Dead Family Database http www.lddb.com laserdisc.php?id 4389 Infrared Sightings at LaserDisc Database Scott, John ... Clip from Infrared Sightings on FritzPerlberg.com Grateful Dead Category Grateful Dead Category ... more details
refimprove date October 2009 File Infraszauna 001.jpg thumb The interior of an infrared sauna. An infrared sauna uses Infrared heater infrared heaters to emit infrared thermal radiation radiant heat which is absorbed directly into the human body, unlike traditional sauna s which heat the body indirectly via air or steam. Health benefit claims A study of patients with rheumatoid arthritis and ankylosing spondylitis showed a reduction in pain, stiffness and fatigue during infrared sauna therapy, but these did not reach statistical significance. ref cite journal author Oosterveld FG, Rasker JJ, Floors M, et al. title Infrared sauna in patients with rheumatoid arthritis and ankylosing spondylitis. A pilot study showing good tolerance, short term improvement of pain and stiffness, and a trend towards long term beneficial effects journal Clin. Rheumatol. volume 28 issue 1 pages 29 34 year 2009 month January pmid 18685882 doi 10.1007 s10067 008 0977 y ref Energy expenditure controversy Some infrared sauna proponents claim that the sauna is an effective method for considerably raising the rate of basal metabolic rate energy expenditure in the body. Proponents typically quote the Journal of the American Medical Association stating A moderately conditioned person can easily sweat off 500 grams in a sauna, consuming nearly 300 kcal, which is equivalent to running 2 3 miles. A heat conditioned person can easily sweat off 600 800 kcal with no adverse effects. While the weight of the water loss can be regained by drinking water, the calories consumed will not be. ref cite journal author Dean W title Effect of sweating journal JAMA volume 246 issue 6 pages 623 year 1981 month August pmid 7253113 doi url http jama.ama assn.org cgi reprint 246 6 623.pdf letter ref ref cite journal author Searle AJ title Effects of the sauna journal JAMA volume 247 issue 1 pages 28 year 1982 month January ... not increase body heat generation and calorie burn. References reflist DEFAULTSORT Infrared Sauna Category ... more details
Refimprove date December 2007 Cleanup date December 2009 An infrared blaster or IR blaster is a device that emulates an infrared remote control to autonomously control a device that is normally controlled only by remote control key presses. The most common use of an IR blaster is to allow a recording device such as a digital video recorder DVR or video cassette recorder VCR to change the channel on an external tuner such as a cable box or satellite receiver. This way, the recording device can automatically select the correct channel to record before starting the recording process. Another common use is to extend infrared signals in order to place remote controlled products behind closed doors. gallery Image tivo irblaster small.jpg Example IR Blaster with standard 1 8 plug Image Ir blaster on cable box.jpg IR Blaster stuck to a cable tv tuner gallery References http www.mythtv.org wiki IR Blaster Using an IR Blaster with MythTV Unreferenced date March 2010 references Category Infrared technology tech stub ... more details
Infobox Album See Wikipedia WikiProject Albums Name Infrared Roses Type Live album Artist Grateful Dead Cover DECD019.jpg Released November 1, 1991 Recorded Genre Psychedelic rock , Jam band jam Length 58 18 Label Grateful Dead Records Grateful Dead small GDCD40142 small Producer Bob Bralove Reviews Allmusic Rating 2 5 Allmusic class album id r8544 pure url yes link Last album One From the Vault br 1991 This album Infrared Roses br 1991 Next album Two from the Vault br 1992 Infrared Roses is a Live album live compilation album by the Grateful Dead . It is a conglomeration of their famous Musical improvisation improvisational segments Drums and Space. Somewhere in the middle of the second set of a Grateful Dead concert came a period of musical improvisation . This part of the concert is commonly referred to as Space, and came right after a drum solo or duet. Infrared Roses is a compilation of these performances. There are no recognizable songs from the band s repertoire on this release. Robert Hunter lyricist Robert Hunter , probably best known for his numerous collaborations as lyricist with the Grateful Dead , created the names of the tracks for the album. Music from Infrared Roses was used as the soundtrack for the 18 minute Grateful Dead video Infrared Sightings . Track listing Musicians Listed in order of appearance on each track . Crowd Sculpture Bralove 2 21 Deadheads Parallelogram Hart, Kreutzman 5 06 Kreutzmann trap drum left, Mickey Hart trap drum right Hart Beast Large Drums and Beam Kreutzmann Timbales Little Nemo in Nightland Bralove, Garcia, Lesh, Weir 6 16 Garcia Guitar, Weir Guitar, Lesh Bass Riverside Rhapsody Garcia, Hart, Kreutzmann, Lesh, Mydland, Weir 3 55 Garcia Guitar, Weir Guitar, Lesh Bass, Mydland Keyboards, Kreutzmann Drums, Hart Drums and Electronic ... Marimba , Lesh Bass Mydland Midi Keyboard Rattles, Shakers, Toms Infrared Roses Bralove, Garcia, Lesh ... de Infrared Roses ... more details
In physics , an infrared divergence is a situation in which an integral , for example a Feynman diagram , diverges because of contributions of objects with very small energy approaching zero, or, equivalently, because of physical phenomena at very long distances. The infrared IR divergence only appears in theories with massless particles such as photon s . They represent a legitimate effect that a complete theory often implies. One way to deal with it is to impose an infrared cutoff and take the limit as the cutoff approaches zero and or refine the question. Another way is to assign the massless particle a fictitous mass, and then take the limit as the fictitous mass vanishes. The divergence is usually in terms of particle number and not empirically troubling, in that all measurable quantities remain finite. ref name Kaku ref name IZ Unlike in the case of the UV catastrophe where the energies involve diverge. Bremsstrahlung example When an electric charge is accelerated or de accelerated it emits Bremsstrahlung radiation . Semiclassical electromagnetic theory , or the full quantum electrodynamic analysis, shows that an infinite number of soft photons are created. But only a finite number are detectable, the remainder, due to their low energy, falling below any finite energy detection threshold, which must necessarily exist. ref name Kaku cite book last Kaku first Michio title Quantum Field Theory A Modern Introduction year 1993 location New York publisher Oxford University Press isbn 0195076524 , pages 177 184 and appendix A6 ref However even though most of the photons are not detectable they can t be ignored in the theory Quantum electrodynamic calculations show that the transition amplitude between any states with a finite number of photons vanishes. Finite transition amplitudes are obtained only by summing over states with an infinite number of soft photons. ref name Kaku ref name IZ cite book author Claude Itzykson, Jean Bernard Zuber year 1980 title Quantum Field ... more details
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