Pyrometer- Handbook - Contika

10. Fibre Optics Pyrometer
A fibre optics pyrometer consists of 3 parts: an optical
head, a glass fibre and a signal processing unit. The optical
head contains only the optics and no electronics. In the
converter is the detector and the signal processing unit.
The radiation, coming in through the optical head, is
transported via the lens system into the fibre where it can
be transmitted along for up to 30 metres to the converter.
The glass fibre of the optical fibre is no longer transparent
at higher wavelengths. Consequently, the measurement of
temperatures with glass fibres is limited to 150 °C and
above.
Fibre optics pyrometers have proven themselves in
difficult situations. Splitting the two components has
advantages in these instances:
•High temperatures: The optical head and the fibre have
no electronic components and can easily withstand
temperatures of up to 250 °C. The pyrometer unit itself,
however, is installed at a cooler location and will not be
damaged.
Pyrometer Handbook
function
Illustration 23:
fibre optics
pyrometer
advantages
high ambient
temperatures
41