>> Thermal IR cameras are pretty well established as equipment for e.g. 
>> police helicopters to search for or track people (particularly at night).
>
> I'll bet they're damned expensive though. ;-)

Not *that* expensive, we use one in the lab to see the hot-spots on LCDs.  I 
don't think it was more than a few times the cost of a good visible-light 
camera (ie about 3-4K).

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