Cut Fiber - HBM FS22 SI User Manual

Measuring
the right) and the light that is reflected at the surface will
take random directions ending up outside the core.
Reflective Fiber Ending Refractive Fiber Ending
Fig. 4.10
4.4.4

Cut Fiber

When the fiber, for any reason, is broken between two
sensors in a series, the sensors that are after the fault
may disappear from the optical spectrum and may not be
detected.
There may also be the case that the fiber is cut, but not
completely spread apart (e.g. the fiber is damaged in an
area covered with glue). This will cause a Fabry-Pérot
effect – the light will suffer multiple reflections inside the
cavity creating sinusoidal background reflection. Fig. 4.11
shows a schematic representation of the reflected spec­
trum for these three presented cases.
FS22 SI 47
A4249-8.0 HBM: public