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



I agree, a red filter makes sense. Spontaneous ideas are often
not good. Is it not true that a black body absorber whose
temperature is measured objectively (rather than by matching
colors subjectively) is also called a pyrometer? It can be calibrated
to measure a very high temperature, for a given geometric setup.
Or to measure the irradiance in W/m^2 (from which T can be
calculated, if other parameters, such as distance, are known).
Ludwik Kowalski

Leigh Palmer wrote:

...; A simple chopper won't work. There are color differences that would
be unaccounted for. The method used is to superimpose the image of a
filament of calibrated temperature and one of unknown temperature and
then to vary the calibrated temperature source current unitil a match
is obtained. To go to higher temperatures a red filter is provided
which attenuates both images.