How do thermal cameras work?
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Hot enough objects will glow red, and then orange, and then yellow, and then white, etc, but really all objects glow, with what’s called black-body radiation. Objects around room temperature glow in infrared, with wavelengths too long to see, which is why we don’t see objects glow until they get very hot (or if they have some other way of creating light, like through chemical reactions). Just like normal cameras are designed to record visible light, thermal cameras are designed to record infrared light, and then translate it into an image that humans can see and gauge temperature from.
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