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i took apart the cameras and ir blaster.
quite interessting.
IR Blaster:
its very simple. On the outer rubber sleeve is a thermo sensor
the main component is a IR Laser Diode with a lens behind a diffraction grating.
undeaneath the Laser is a TEC / Thermo Electric Cooler to stabilize the temperature and the wavelength.
https://i.imgur.com/xfOYVNN.jpg
IR Camera
a specially coated lens which is quite big inside, behind that a IR pass filter and then the sensor. Looks like a CCD but quite a big one, large pixels = more sensitive.
https://i.imgur.com/lmk8HUG.jpg
Visible light camera:
well just a normal camera module. with a IR cut filter of course.
notice the die size, or the pixel area is much smaller.
https://i.imgur.com/Jl00bdB.jpg
IR vs visible comparison.
https://i.imgur.com/fxkKLxw.jpg