Because the attenuation of the glass varies with wavelength, and
since the wavelength of the emission varies with temperature (white hot
vs red hot) I don't see how one could distinguish a between the
attenuation caused by the glass and the black body emission of the
source. I suppose one could develop a look up table calibration for
a particular setup, as long as the envelop temperature is known (since
it
would be contributing to the reading).

Roman Black wrote:
>
> Robert Rolf wrote:
> >
> > It very much depends on what kind of glass you're trying to look
> > through.
>
> You obviously know more about this than I do,
> but it occurs to me that you could do one
> set of tests with a thermocouple and compare
> to the reading on the non-contact unit.
> Surely this would give a simple chart or table
> that would then allow the more convenient system
> to be used with ok accuracy?
> -Roman
>
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