Thermal infrared imaging technology
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22-11-2009, 11:54 AM

i want to know more about this topic
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please read topicideashow-to-INFRARED-AND-THERMAL-IMAGING where Thermal infrared imaging technology added
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you can see these pages to get the details on infrared-and-thermal-imaging


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send me abstract for Thermal infrared imaging technology
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you can refer these page details of "Thermal infrared imaging technology" bellow link...



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.docx   INFRARED THERMAL.docx (Size: 334.74 KB / Downloads: 22)

.docx   Thermal imaging.docx (Size: 13.08 KB / Downloads: 15)

.pptx   IMAGING TECHNOLOGY.pptx (Size: 353.9 KB / Downloads: 14)


Thermal imaging is the process of producing a visible two-dimensional image of a scene by virtue of the differences in radiation reaching the aperture of the imaging device which apparently originate at various parts of the scene. This process depends upon the fundamental property that all bodies at temperatures above absolute zero, emit thermal radiation in predictable amounts that depend upon the nature of the surface and its absolute temperature.Thermal imaging systems extend our vision beyond the short-wavelength red into the far infrared.Since the human eye does not respond in the absence of visible light,a device is needed to image the objects making use of the infrared rediation emitted by the object.
Any thermal imaging system requires three elements:
1. An optical system which collects radiation reaching the aperture of the device and
brings it to a focus to form an image of the scene.
2. A detector which absorbs the radiation so focussed, thereby undergoing some
change in its characteristics.
3. A presentation system which forms a visible image from the changes in the detector
characteristics and thus enables the eye to "see" the thermal image.


The first thermal imaging system was the circa-1930 Evaporagraph.It is shown in fig 1. The evaporagraph could not satisfy most thermal imaging tasks because of limited snsitiivity and response time limitations.Two alternative approach to thermal imaging were evident in 1940’s.One was to develop discrete detector, mechanically scanning analogeus of telivision system. The other was to develop an infrered vidicon ,or some other non mechanically scanning devices.the original scanning thermal imagers were called 1952 the first thermograph was built using a 16 inch search light reflector,a dual axis scanner and a bolometrer detector.Upto 1950 , the development of fast-framing thermal imagers was infeasible because detectors with fast time response was not available.Later with the introduction of strip mapper tecmology , advanced thermal imagers were built.


Thermal Radiation :

Thermal radiation is electromagnetic radiation generated by the thermal motion of charged particles in matter. All matter with a temperature greater than absolute zero emits thermal radiation. The amount of radiation emitted by an object increases with temperature .The emitted radiation mainly falls under Infrared region of electromagnetic spectrum. These Radiations are used to create the Thermal image of the object called Thermograms.

Emissivity :

Emissivity is a term representing a material's ability to emit thermal radiation. Each material has a different emissivity.A material's emissivity can range from a theoretical 0.00 (completely not-emitting) to an equally-theoretical 1.00 (completely emitting) .The emissivity often varies with temperature.Depending on the emissivity of the object , difference in intensity is observed in the thermogram


Thermal images are captured using a thermal imaging camera.A simple thermal imaging camera is shown in fig 3. They do not require any form of illumination to operate. Thermal imaging cameras detect radiation in the infrared range of the electromagnetic spectrum and produce images of objects.The images produced are called Thermograms.

Thermal imaging camera

Theory of operation :

Infrared energy is just one part of the electromagnetic spectrum that encompasses radiation from gamma rays, x-rays, ultra violet, a thin region of visible light, infrared, microwaves, and radio waves. These are all related and differentiated in their wavelength. All objects emit a certain amount of black body radiation as a function of their temperatures. Generally speaking, the higher an object's temperature is, the more infrared radiation it emits. Thermal imaging camera can detect this radiation in a way similar to an ordinary camera does visible light. It works even in total darkness because ambient light level does not matter


Thermal imaging systems has helped us to extend our vision beyond the short wavelength red into the far infrared region. It has led to technologies like night vision which are very useful to mankind.It is increasingly becoming accepted by physicians as a supplementary diagnostic as well as monitoring tool for various diseases. But it is still not reached to many parts of the world.

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