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There
are a wide number of devices that utilize fiber optics to aid in measuring temperature.
Most are actually slight variation of radiation thermometers, but not all. Most
all depend upon a temperature sensing component being placed on the tip of the
fiber optic's "free end". The other end is attached to a measuring system
that collects the desired radiation and processes it into a temperature value.
Like a lot of things there are some notable exceptions: the bulk fiber optic sensors
which measure the temperature of the fiber along its length and produce eith an
average temperature or some measure of the temperature distribution along the
length of the fiber.
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