AWOL:
because it wouldn't work; ordinary glass mirrors don't reflect heat (long IR).
What about surface-coated mirrors?
Glass doesn't transmit the IR well, but if it comes off the metal layer directly?
Old laser printers and scanners can be a good source of these.
Sorry about the lag in response time - I didn't see this for some reason.
I don't think a front-surface mirror would work, either; from the research I did, I never ran across anything about using a front-surface mirror, but then again everything was about the sensors and such, using special long IR transmissive lenses and elements made from something a bit more exotic than usual (thus a part of the higher price). I'm not really certain though; perhaps something to look into (if this could work, then you could potentially have a much higher scan rate, up to the limit of the sensor itself - which I understand isn't "high speed", but maybe it could be made better - hmm, I wonder what peltier cooling would do for speed?)...
