Eli5: how do thermal cameras capture heat without any physical contact

Question

Eli5: how do thermal cameras capture heat without any physical contact

In: 4

Answer 1

If you go out on a sunny day, close your eyes and face the Sun, you will feel warmth on your face than won’t be there if you turn in any other direction. That’s because the Sun emits a lot of infrared light which you can feel as warmth. Infrared cameras also capture this infrared light, but they are much more sensitive.