back in the day, I worked on the thermal imaging system on the M-1 tank.
it was the most advanced and sensitive system t time. I could tweek it to the point it could see the snow on top of a tree branch at 20 below zero.
but it could NOT see the driver of a Humvee thru the windshield or a passenger if the plastic window was up.
the thing is, thermals “see” the first object in it’s line of sight. it can’t (or couldn’t) see thru glass or plastic.
if I were trying to defeat a TIS or even an old fashioned infared system, I would use clear plastic staples to a frame. that way I could see the other guys, but would be screened from their system. since the shape of the screen would show up and be a giant give away, I would camouflage it with weeds, branches, whatever is in the immediate area that would break up the shape of the screen.
don’t know if it would work or not, but that would be my best guess to staying undetected.
