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Author Topic: How does a thermal camera works?  (Read 13368 times)

Offline erickejah

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How does a thermal camera works?
« on: 22/03/2009 18:43:33 »
Can you briefly explain the concept in which this technology is based on??
tx ;)


 

Offline Madidus_Scientia

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How does a thermal camera works?
« Reply #1 on: 23/03/2009 08:05:45 »
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/
 

Offline Dr.IC

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How does a thermal camera works?
« Reply #2 on: 24/03/2009 08:16:21 »
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.
 

Offline erickejah

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How does a thermal camera works?
« Reply #3 on: 24/03/2009 23:34:16 »
tx, now I know it.  :D :D :D
 

Offline Yomi

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How does a thermal camera works?
« Reply #4 on: 05/04/2009 12:38:28 »
Friend check out http://en.wikipedia.org/wiki/Thermographic_camera you will get your answer in wikipedia pages....
 

Offline swansont

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How does a thermal camera works?
« Reply #5 on: 08/04/2009 20:30:21 »
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.

——

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.
 

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How does a thermal camera works?
« Reply #5 on: 08/04/2009 20:30:21 »

 

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