HBK FS22SI, User Manual

Page: 32 / 90

FS22SI
MEASURING
32
Power indBm
Threshold
Range 1 Range 2
Range 3
Wavelength in nm
undetected peak
detected peaks
Threshold
Threshold
Fig. 4.5 Smart Peak Detection (SPD) detection method
4.4 Common Measuring Difficulties
There may be the possibility of having measuring malfunctions due to several problems
in the sensing network or optical connections. A list of some of the usual problems is
described below with the explanation for its occurrence and correction.
4.4.1 Dirty Connector
When an interrogator is repeatedly being plugged in and out with optical connectors, it is
very important that the connectors are cleaned prior to any connection. If not, dust and
moisture can be deposited in the interrogator adaptor and this will compromise measure­
ments. On
Fig. 4.6 a picture of a magnified connector is presented. The dark gray circle
corresponds to the fiber cladding and the small light gray circle is the core of the fiber.
One picture for a clean connector and one picture for a dusty connector are presented.
Clean connector
Dirty connector
Fig. 4.6 Magnified Clean vs Dirty connector