HBM FS22 SI User Manual page 42

Measuring
42
come the threshold, only one FBG sensor will be com­
puted, thus eliminating problems indexed to the measure­
ments. Additionally, any influence these spurious peaks
could exert on the measurements is canceled.
Summarily, the increased robustness provided is espe­
cially suited to overcome the limitations found in the con­
ventional methods where low and high reflectivity FBGs
coexist and signal losses are often a problem. SPD
therefore improves the stability and accuracy of the mea­
surements, contributing to the system's efficiency.
Important
When SPD is active, the total number of sensors that can
be measured by the interrogator should not exceed 400.
Range 1
Fig. 4.5
A4249-8.0 HBM: public
Range 2
Wavelength in nm
Range 3
detected peaks
undetected peak
FS22 SI