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The Bragg Networks are fiber optic sensors to measure deformations, vibrations, temperature, inclination and other parameters.

A Bragg network is a periodic or pseudo-periodic perturbation of the effective refractive index in the core of a fiber-optic. 

The perturbation is usually approximately periodic in a certain length of, for example, a few millimetres or centimetres, and the period is around hundreds of nanometres.

Properties of the Bragg technology:

The use of Bragg sensors (FBG Fiber Bragg Grattings) has the following characteristics:

  • FBG are small in size and light in weight.
  • FBG are immune to electromagnetic interference, including large surges.
  • The components of FBG are insulating materials (glass)
  • FBG are intrinsically passive sensors, that is, they do not require auxiliary power.
  • FBG can be used in explosive environment, as they do not heat up or produce sparks.
  • FBG can be placed far from the interrogator element 10km) by means of dark fibers.
  • A fiber can multiplex between 15FBG to 30 FBG, depending on the application.
  • They are not subject to corrosion.
  • Special FBG can be designed for high (> 700°C), cryogenic temperatures, etc.