Originally Posted by
PDR1
Erm...what other kind of IR detection do you think there is??
PDR
Thermal IR typically detects around 10 micron wavelength, in the atmospheric absorption window, and shows up "hot" objects. There are other IR bands/wavelengths. E.g. near IR that is adjacent to visible wavelengths and might be part of what is detected by low light image intensifiers. So for practical purposes, I'd say you're right and it's a tautology. If you're taking a wider tech. view, not so much.