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I believe that it most likely not see the plexiglass wall. The plexiglass will transmit the IR from the camera, this means that the IR will go right through, not bounce back to the camera.
Hope this information helps.
Actually... IR transmission in plexiglass is pretty wonky, with many peaks and valleys. See Plexiglass Sheets, Fiberglass, UHMW, Polycarbonate & Engineering plastics: Infrared and Ultraviolet Transmission in Plex…
I never thought to try looking at a plexiglass sheet with the IR cameras to see if at the particular wavelengths the camera uses Plexiglass (aka clear Acyrlic) is actually transparent. It may, in fact, be opaque.
The other issue is surface specularity, though. If the plexiglass is also polished, the laser may just bounce off in a direction the camera can't see it...
There is one solution to both problems that may or may not work in your context: sprinkle some fine dust on the surface, like talc powder. There are also special sprays you can get for laser scanning that (temporarily) add a diffuse film to the surface. Of course you need to clean it off afterwards, but a dustvac and/or a wet cloth takes care of talc.