Re: Optical pyrometers, was R = V/I ?

[Joseph Bellina <jbellina@SAINTMARYS.EDU>]

Have you used a disappearing wire optical pyrometer?  I find it hard to
imagine that different folks would read it differently...is there data
on this?

joe

On Mon, 8 May 2000, Ludwik Kowalski wrote:

> 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