Hi,
Now the most important point is benefits of FBG Optical Sensing :
These are are nonconductive, electrically passive, and immune to EMI-induced noise.
No/ little loss in signal integrity on interaction with a high-power tunable laser enables measurements over long distances.
Unlike electrical sensing systems, each optical channel can measure dozens of FBG sensors,
greatly reducing the size, weight, and complexity of the measurement system.
Optical sensing is ideal for applications electrical sensors such as foil strain gages, thermocouples, and vibrating wires have proven ineffective or tough to use due to difficult environmental conditions and/or long distances.
Thanks,
Rajguru