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[Phys-L] Laser Temperature Gun



One of the janitor people came by my room with a new
temperature-measuring device that I liked, but can't figure out. It is
a gun shaped thing that "shoots" a laser beam at a vent in the ceiling.
The device has a digital readout of the temperature of the spot the
laser is hitting. It seemed to work. The temperature of the air output
was 85 degrees and the temperature of the return air was 70 degrees.
Does anyone out there know how this could operate? Thanks.
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