Infrared rays are used in physical therapy.
Remote Control
Flashing LEDs and photodiodes are used ubiquitously in remote controls, automation systems, security systems, some mobile phones (infrared), etc. The infrared rays do not distract the person's attention because of its invisibility.
Interestingly, the infrared remote control domestic easily fixed with a digital camera.
When painting
Infrared emitters are used in industry for drying paint surfaces. Infrared drying method has significant advantages over conventional, convection method. The first is, of course, the economic effect. Speed ​​and power, used in infrared drying less the same performance with traditional methods.
Food Sterilization
Using infrared radiation sterilizing foods to disinfect.

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History of infrared radiation

Infrared radiation was discovered in 1800 by English astronomer William Herschel. Pursuing the study of the Sun, Herschel was looking for a way to reduce heating tool with which observations were made. Defining by thermometers actions of different parts of the visible spectrum, Herschel discovered that the "high heat" is for a strong red color and possibly "the apparent refraction." This research laid the foundation for the study of infrared radiation.

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Health hazard

Very strong infrared radiation in areas of high heat can dry out the mucous membrane of the eye. The most dangerous when not accompanied by emission of visible light. In such places need to wear special goggles for the eyes.

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IR Spectrum Table

Infrared - electromagnetic radiation spectral region between holding the red end of the visible light (with a wavelength of [1] λ = 0,74 mm) and microwave radiation (λ ~ 1-2 mm).
Optical properties of materials in the infrared radiation differ significantly from the properties in the visible radiation. For example, a layer of water of several centimeters opaque to infrared radiation with λ = 1 micron. Infrared radiation is a large part of lamp bulbs, HID lamps, about 50% of the sun's radiation, infrared radiation emitted some lasers. For registration are in thermal and photovoltaic receivers, as well as special photographic materials [2].
Now the whole range of the infrared radiation is divided into three components:

  • short-wavelength region: λ = 0,74-2,5 um;
  • medium wave region: λ = 2,5-50 microns;
  • long-wave region: λ = 50-2000 mm;

    Recently, the long-wavelength edge of this band is isolated in a separate, independent range of electromagnetic waves - terahertz radiation (submillimeter radiation).
    Infrared radiation is also called the "heat" radiation as infrared radiation from hot objects perceived by the human skin as a feeling of warmth. At this wavelength, emitted body conditions of heating temperature: the higher the temperature, the shorter the wavelength and higher radiation intensity. The emission spectrum of a black body at a relatively low (up to a few thousand Kelvin) temperatures lies mostly in this range. Infrared radiation is emitted excited atoms or ions.

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