How does a thermal camera/scope work?
In: Technology
You can start with how a normal camera works. Search this sub for that.
Once you understand that, you can replace the pixels which detect visible light with pixels that detect far-infrared light. Far-infrared light is emitted by the ‘heat glow’ of objects around room temperature. Raising temperature raises the light’s frequency, which is why things can glow red hot and eventually white hot, but that’s a tangent.
Basically, everything of normal temperature glows in these frequencies.
Hotter objects emit more of this light. They appear brighter to your camera.
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