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Referring to a comment about a simple glowing wire pyrometer,
Leigh wrote:
I don't understand. An optical pyrometer is used to measure
temperature objectively. "Pyrometer" merely means any
instrument or device (slump cones are also pyrometric devices) .
used to measure high temperatures. A calorimetric radiometer
is only one kind of pyrometer (usually calleda "bolometer").
A measurement of T with a pyrometer in which we match colors
(of a glowing wire and of the background behind it) is "subjective",
in my terms, because abilities to compare colors are different for
different people. A standard deviation s1 could be determined if
many people were asked to measure T with the same color-based
instrument. That deviation, I suspect, would be considerably wider
than the one based on many measurements made by a single person.
And mean values of T would probably be different for different
observers. But that is only a guess. Another student project?
Ludwik Kowalski