No? This is unusual logic. It both emits and absorbs radiation,
but it doesn't absorb IR? :-)
I don't think so. Try it. I've pointed my Raytek at night skies and daytime
skies, with clouds, and read similar very cold temperatures. When I point
a $1K Exeltech at the same cloudy sky, I read a much higher temp. I think
the Raytek measures emissive power in a narrow wavelength band that excludes
the strong water vapor absorption bands around 1, 1.4, and 1.8 microns, but
the Exeltech looks at more of the spectrum.
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