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((more citations needed | date=November 2014))

'''Infrared lamps''' are electrical devices which emit [[infrared]] radiation.  Infrared lamps  are  commonly used in [[radiant heating]] for industrial processes and building heating. Infrared [[LED]]s are used for communication over [[optical fibers]] and in [[remote control]] devices. Infrared lamps are also used for some [[night vision device]]s where visible light would be objectionable.  Infrared lamp sources are used in certain scientific and industrial instrument for chemical analysis of liquids and gases; for example, the [[pollutant]] [[sulfur dioxide]] in air can be measured using its infrared absorption characteristics.

==Types==
[[Incandescent light bulb]]s use a [[tungsten]] filament heated to high temperature to produce visible light and, necessarily, even more infrared radiation.  Round bulbs, often tinted red to reduce visible light, provide infrared radiant heat suitable for warming of people or animals, but the power density available is low. The development of quartz halogen linear lamps allowed much higher power density up to 200 watts/inch of lamp (8 w/mm), useful for industrial heating, drying and processing applications.<ref name=KS01>Raymond Kane, Heinz Sell (ed.) ''Revolution in Lamps: A Chronicle of 50 Years of Progress, Second Edition'', CRC Press, 2001 ((ISBN|0824709179)), Chapter 3 ''The T3 Quartz Infrared Lamp'')</ref>
By adjusting the voltage applied to incandescent lamps, the spectrum of the radiated energy can be made to reduce visible light and emphasize infrared energy production. Different wavelengths of infrared radiation are differently absorbed by different materials.

Some applications use the heat generated by the standard incandescent lamps, such as [[incubator (egg)|incubator]]s, [[Brooding|brooding boxes]] for [[poultry]],<ref>[https://books.google.com/books?id=u68zP20dOUwC&pg=PA221 "Storey's guide to raising chickens"] ((webarchive|url=https://web.archive.org/web/20170128034645/https://books.google.com/books?id=u68zP20dOUwC&pg=PA221 |date=28 January 2017 )) Damerow, Gail. Storey Publishing, LLC; 2nd edition (12 January 1995), ((ISBN|978-1-58017-325-4)). page 221. Retrieved 10 November 2009.</ref> heat lights for [[reptile]] [[terrarium|tanks]],<ref>[https://archive.org/details/277secretsyoursn0000coop/page/161 "277 Secrets Your Snake and Lizard Wants you to Know Unusual and useful Information for Snake Owners & Snake Lovers"] ((webarchive|url=https://web.archive.org/web/20170129075111/https://books.google.com/books?id=LG9sQEw8zDEC&pg=PA161 |date=29 January 2017 )) Cooper, Paulette. Ten Speed Press (1 March 2004), ((ISBN|978-1-58008-035-4)). Page 161. Retrieved 10 November 2009.</ref> novelty lamps such as [[lava lamp]]s, and the [[Easy-Bake Oven]] toy. Heat lamps may have a red coating to reduce the visible light emitted.

Solid-state [[light emitting diode]]s can be produced to be efficient sources of near-monochromatic infrared energy.  Such sources can be rapidly [[modulation|modulated]] for communication systems and control signals.  A light emitting diode can be closely coupled to an optical fiber, allowing infrared signals to be sent up to scores of kilometres without amplification.

==Heating==
((main|Infrared heater))
Infrared heating uses infrared lamps, commonly called '''heat lamps''', to transmit infrared radiation to the body that is being heated.  When a body with a large surface area needs to be heated, an array of infrared lamps is often used.  The lamp commonly contains an incandescent bulb that produces 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).<ref>Calculation Example Infrared Heating - ((Cite web|url=https://infrarotheizstrahler24.de/kalkulationsbeispiele-infrarotheizungen/|title=Calculate Infrared Heating|date=3 December 2017 ))</ref>

==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)|lens]] into a narrow beam.  The beam is [[modulation|modulated]], i.e. switched on and off, to encode the [[data]]. The receiver uses a [[silicon]] [[photodiode]] to convert the infrared radiation to an electric [[Current (electricity)|current]]. It responds only to the rapidly pulsing signal created by the transmitter, and filters out slowly changing infrared radiation from ambient light. Infrared communications are useful for indoor use in areas of high population density. IR does not penetrate walls and so does not interfere with other devices in adjoining rooms. Infrared is the most common way for [[remote control]]s to command appliances.

==See also==
* [[Infrared#Applications|Infrared communications applications]]

==References==
((reflist))

((Artificial light sources))

[[Category:Types of lamp]]

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