In 1800 the astronomer Sir William Herschel discovered that infrared radiation is a type of invisible radiation in the spectrum lower in energy than red light, by means of its effect on a thermometer.
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24 Facts About Infrared radiation
2.
Infrared radiation is emitted or absorbed by molecules when changing rotational-vibrational movements.
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3.
Infrared radiation is used in industrial, scientific, military, commercial, and medical applications.
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4.
Infrared radiation astronomy uses sensor-equipped telescopes to penetrate dusty regions of space such as molecular clouds, to detect objects such as planets, and to view highly red-shifted objects from the early days of the universe.
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5.
Increasingly, terahertz radiation is counted as part of the microwave band, not infrared, moving the band edge of infrared to 0.
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William6.
Thermal infrared radiation has a maximum emission wavelength, which is inversely proportional to the absolute temperature of object, in accordance with Wien's displacement law.
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7.
Infrared radiation is generally considered to begin with wavelengths longer than visible by the human eye.
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8.
Infrared radiation is popularly known as "heat radiation", but light and electromagnetic waves of any frequency will heat surfaces that absorb them.
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9.
Thermal Infrared radiation is characterized by a particular spectrum of many wavelengths that are associated with emission from an object, due to the vibration of its molecules at a given temperature.
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10.
Infrared radiation is used in night vision equipment when there is insufficient visible light to see.
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11.
Infrared radiation can be used to remotely determine the temperature of objects .
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12.
Since infrared radiation is emitted by all objects based on their temperatures, according to the black-body radiation law, thermography makes it possible to "see" one's environment with or without visible illumination.
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13.
The amount of Infrared radiation emitted by an object increases with temperature, therefore thermography allows one to see variations in temperature .
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14.
Infrared radiation communications are useful for indoor use in areas of high population density.
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15.
Infrared radiation is the most common way for remote controls to command appliances.
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16.
Infrared radiation lasers are used to provide the light for optical fiber communications systems.
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17.
Infrared radiation vibrational spectroscopy is a technique that can be used to identify molecules by analysis of their constituent bonds.
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18.
Sensitivity of Earth-based infrared telescopes is significantly limited by water vapor in the atmosphere, which absorbs a portion of the infrared radiation arriving from space outside of selected atmospheric windows.
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19.
Infrared radiation can be used to detect protostars before they begin to emit visible light.
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20.
Infrared radiation light is useful for observing the cores of active galaxies, which are often cloaked in gas and dust.
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21.
Infrared radiation cleaning is a technique used by some motion picture film scanners, film scanners and flatbed scanners to reduce or remove the effect of dust and scratches upon the finished scan.
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22.
Since the Infrared radiation is invisible, special IR-proof goggles must be worn in such places.
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23.
Discovery of infrared radiation is ascribed to William Herschel, the astronomer, in the early 19th century.
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24.
Infrared radiation was surprised at the result and called them "Calorific Rays".
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