On 17/04/2020 21:50, Harry Bloomfield wrote:
Martin Brown explained :
For precise none contact work you put a black sticker on the target
that has the right emissivity for the measurement device you are
using. But for mass screening it is easier to fiddle the detector to
match "skin".

I knew about the black tape trick, but never saw them stick tape on the
people they were checking.


The black tape has to be the correct type. Some black tape may actually
act as a mirror to IR and so you are measuring the temperature of what
it is reflecting rather than what it is attached to.
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