How do thermal cameras work?
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All objects emit infrared light. Hot objects emit more infrared light than cold objects. We can’t see infrared light because our eyes are only designed to see a small range of light frequencies, and the frequency of infrared light is too low for our eyes to detect, just like how we can’t see ultraviolet light or x-rays. However, we can make camera sensors that are tuned to detect infrared light instead of visible light. Since the amount of infrared light being emitted by an object is a very good estimate of that object’s temperature, a camera with an infrared sensor is a thermal camera.
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