4. Conclusion and outlook

Measurement technology based on Bragg gratings has a number of advantages: firstly, its sensitivity and linearity (within certain limits) to user-defined parameters (temperature, deformation, etc.), and secondly, the spectral demultiplexing possibilities offered by the finesse of the gratings. In addition to the traditional properties provided by optical fibers (electro-magnetic immunity, low weight and small diameter, resistance to harsh environments...), Bragg grating measurement has the decisive advantage (over other optical methods) of being able to be referenced absolutely, and therefore to make it possible to disconnect and reconnect sensors or the measurement system, without requiring recalibration (unlike, for example, interferometric measurements) since the spectral measurement is a "signature" independent of intensity fluctuations. The state of the art of this technique allows...