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- Created 2012-02-26
) light is
s than those of
, extending from the nominal
edge of the
(nm) to 1 mm. This range of wavelengths corresponds to a
range of approximately 430
down to 300
. Most of the
emitted by objects near room temperature is infrared.
Infrared radiation was discovered in 1800 by astronomer
, who discovered a type of invisible radiation in the light spectrum beyond red light, by means of its effect upon a thermometer. Slightly more than half of the total energy from the Sun was eventually found to arrive on Earth in the form of infrared. The balance between absorbed and emitted infrared radiation has a critical effect on Earth's
Infrared light is emitted or absorbed by
s when they change their
movements. Infrared energy elicits
al modes in a
through a change in the
, making it a useful frequency range for study of these energy states for molecules of the proper symmetry.
examines absorption and transmission of
s in the infrared energy range.
Infrared light is used in industrial, scientific, and medical applications. Night-vision devices using active near-infrared illumination allow people or animals to be observed without the observer being detected.
to penetrate dusty regions of space, such as
s; detect objects such as
s, and to view highly
objects from the early days of the
. Infrared thermal-imaging cameras are used to detect heat loss in insulated systems, to observe changing blood flow in the skin, and to detect overheating of electrical apparatus.
Thermal-infrared imaging is used extensively for military and civilian purposes. Military applications include
, homing and tracking. Humans at normal body temperature radiate chiefly at wavelengths around 10 μm (micrometers). Non-military uses include
analysis, environmental monitoring, industrial facility inspections, remote temperature sensing, short-ranged
from Wikipedia (last updated: 04 December), licensed under
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Infrared: A Historical Perspective
Infrared Data Association
How to build an USB infrared receiver to control PCs remotely
Herschel's original paper from 1800 announcing the discovery of infrared light
Queue management system
RIAS (Remote Infrared Audible Signage)
Black body radiation
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