Thermal imaging cameras detect radiation in
the infrared range of the electromagnetic spectrum (roughly 9000–14,000
nanometers or 9–14 µm) and produce images of that radiation, called
thermograms. Since infrared radiation is emitted by all objects near room
temperature, according to the black body radiation law, thermography makes it
possible to see one's environment with or without visible illumination. The
amount of radiation emitted by an object increases with temperature; therefore,
thermography allows one to see variations in temperature. When viewed through a
thermal imaging camera, warm objects stand out well against cooler backgrounds;
humans and other warm-blooded animals become easily visible against the
environment, day or night.
In order to perform
the role of noncontact temperature recorder, the camera will change the
temperature of the object being viewed with its emissivity setting. Other
algorithms can be used to affect the measurement, including the transmission
ability of the transmitting medium (usually air) and the temperature of that
transmitting medium. All these settings will affect the ultimate output for the
temperature of the object being viewed. This functionality makes the thermal
imaging camera an excellent tool for the maintenance of electrical and
mechanical systems in industry and commerce.
Thermography is the
science of actually seeing heat. Thermal imaging cameras detect radiation in
the infrared range of the electromagnetic spectrum (roughly 9000–14,000
nanometers or 9–14 µm) and produce images of that radiation, called thermograms.
It is a method that provides information about heat distribution over any
surface. A remote sensing technique is used in this method .It also used to
detect air leakage, pathways, and insulation discontinuities.
Infrared camera
system can detect heat that would normally be invisible to the human eye and
represent it as an image. The appearance and operation of a modern
thermographic camera is often similar to a camcorder. Often the live thermogram
reveals temperature variations so clearly that a photograph is not necessary
for analysis. A recording module is therefore not always built-in.
The CCD and CMOS
sensors used for visible light cameras are sensitive only to the nonthermal
part of the infrared spectrum called near-infrared (NIR). Thermal imaging
cameras use specialized focal plane arrays (FPAs) that respond to longer
Thermal imaging cameras detect radiation in the infrared range of the
electromagnetic spectrum (roughly 9000–14,000 nanometers or 9–14 µm) and
produce images of that radiation, called thermograms. Since infrared radiation
is emitted by all objects near room temperature, according to the black body
radiation law, thermography makes it possible to see one's environment with or
without visible illumination. The amount of radiation emitted by an object
increases with temperature; therefore, thermography allows one to see
variations in temperature. When viewed through a thermal imaging camera, warm
objects stand out well against cooler backgrounds; humans and other
warm-blooded animals become easily visible against the environment, day or
night.
In order to perform
the role of noncontact temperature recorder, the camera will change the
temperature of the object being viewed with its emissivity setting. Other
algorithms can be used to affect the measurement, including the transmission
ability of the transmitting medium (usually air) and the temperature of that
transmitting medium. All these settings will affect the ultimate output for the
temperature of the object being viewed. This functionality makes the thermal
imaging camera an excellent tool for the maintenance of electrical and
mechanical systems in industry and commerce.
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