Fiber optic sensors, Fiber Bragg Grating (FBG) sensors in particular, are among most promising sensors for structural health monitoring of aerospace structures in order to assess the safety and durability during a long period of time in use. These sensors are expected to provide a low-cost maintenance methodology for carbon fiber reinforced composite structures which are now extensively being used for the primary structures. This chapter presents an overview of current use of FBG sensors in aeronautics and astronautics.
