There is a company called Santa Barbara Infrared Inc. and they make things called Dynamic IR Scene Projectors
"In 1999, SBIR introduced MIRAGE=99, the world's first integrated Dynamic IR Scene Projection System, designed to support hardware-in- the-loop testing of missile seekers, FLIRs, counter measure simulation and tracking systems. MIRAGE=99 is a complete turnkey infrared scene projector that utilizes unique resistive emitter array technology to produce high definition dynamic IR scenes."
If you wait, they show a picture of one of their collimaters. Might be something like that.