Quasi-Distributed Fibre Optic Sensing (FBG)

Fibre Bragg Gratings along single-mode fibres are packaged into discrete weldable strain gauges. FBG gauges of differing nominal frequencies and types are joined in series to allow for 10’s of gauges to be monitored on 1 channel which creates a “Station.” An optical interrogator completes sensor identification, interrogation and temperature compensation of distances of up to a few kilometres.

Source: Micron Optics os3155 Strain Gauge with Temp. Compensation

Advantages/Disadvantages of Quasi-Distributed FBG Sensing:

+ Ability to monitor 10’s of gauges on 1 channel: Simple cabling architecture.

+ Fiber Optics cables are impervious to moisture.

- Low strain measurement range.