Naked Science Forum
Non Life Sciences => Technology => Topic started by: erickejah on 22/03/2009 18:43:33
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Can you briefly explain the concept in which this technology is based on??
tx [;)]
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Much the same as a normal camera I believe, except working with infra-red light instead of visible light. In fact you can make a cheap one from an old webcam - http://www.thenakedscientists.com/HTML/content/kitchenscience/exp/make-an-infra-red-camera/
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Thermal imagers are instruments that create pictures of heat rather than light. They measure radiated IR energy and convert the data to corresponding maps of temperatures. Today, instruments provide temperature data at each image pixel and, typically, cursors can be positioned to each point with the corresponding temperature read out on the screen or display. Images may be digitized, stored, manipulated, processed and printed out.
All objects have a certain temperature and emit waves of energy called infrared radiation. Hot objects emit more energy than cold objects. A thermal imager translates these energy waves into a viewable image, which shows a “heat picture” of a scene. The pictures above demonstrate the difference between visable light what the naked eye can see and a thermal image. Move your cursor over the images and you will notice the change between the visable and thermal images.
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tx, now I know it. [:D] [:D] [:D]
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Friend check out http://en.wikipedia.org/wiki/Thermographic_camera you will get your answer in wikipedia pages....
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Much the same as a normal camera I believe, except working with infra-red light instead of visible light. In fact you can make a cheap one from an old webcam - http://www.thenakedscientists.com/HTML/content/kitchenscience/exp/make-an-infra-red-camera/
That's near-IR, though, cutting off at around 1 micron. Thermal imaging uses different detectors, because the peak at body temperature is at around 9 microns.
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And I should note that IR and heat are not synonymous. Things near room/body temperature radiate strongly in the IR, but you can transfer energy with radiation of any wavelength. That's why a microwave works, and why you can burn things with visible light (of sufficient intensity) and a magnifying glass.