Selected-Waveband
Pyrometer
About the selected waveband pyrometer
The selected-waveband pyrometer is sensitive to one waveband only,
e.g. 5µm, and is dedicated to particular, special situations where
other forms of pyrometer are inaccurate. One example of such a
situation is measuring the temperature of steel billets which are
being heated in a furnace. If an ordinary radiation pyrometer is aimed
through the furnace door at a hot billet, it receives radiation from
the furnace walls (by reflection off the billet) as well as radiation
from the billet itself.
If the temperature of the furnace walls
is measured by a thermocouple, a correction can be made for the
reflected radiation, but variations in transmission losses inside the
furnace through fumes, etc., make this correction inaccurate. However,
if a carefully chosen selected-waveband pyrometer is used, this
transmission loss can be minimized and the measurement accuracy is
thereby greatly improved.
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Temperature Measurements
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