HBM FS42, Руководство пользователя, Страница: 42 / 76

Measuring Examples
42
A4250-5.0 HBM: public
FS42
Tip
A connector is more prone to degradation in applications
where you are constantly connecting and disconnecting
sensors. To avoid early degradation and protect the inter­
rogator connector use a small patch cable and an
adapter.
5.4.3 Reflective Fiber Ending
Even when all connections have been performed cor­
rectly, it may occur that the interrogator does not find any
sensor on the array. One of the reasons may be the
excess of reflected light saturating the detectors.
When a fiber is perfectly cut ( Fig. 5.10 on the left) a large
amount of light is reflected right back to the fiber core in
the right direction, heading to the interrogator detectors.
When this occurs, an index matching gel or an angled
termination must be used. If these are unavailable, the tip
of the fiber can be smashed with a metallic tool. This will
destroy the perfect geometry (
Fig. 5.10 on the right) and
the light that is reflected will take random directions end­
ing up outside of the core.