7/29/2019 Thermography Seminar
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THERMOGRAPHY
ABSTRACT
Thermal imaging cameras detect radiation in the infrared range
of the electromagnetic spectrum
(roughly 900014,000 nanometers or 914 m) 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.
INTRODUCTION
Thermography is the science of actually seeing heat. Thermal
imaging cameras detect radiation
in the infrared range of the electromagnetic spectrum (roughly
900014,000 nanometers or 9
14m) 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 non thermal
