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For many applications in industry, monitoring of structural performance is becoming increasingly important in order to reduce maintenance and inspection costs and enhance efficiency. One of the most attractive sensors to build large area sensor network has become the fiber-optic Bragg Grating. Fiber Bragg Grating (FBG) consists of a periodic refractive index modulation of the core of a single-mode fiber. The light propagating in the fiber will be reflected by each of the grating plane. Only the wavelength which satisfies the Bragg condition (law) will experience constructive interference, and close to 100% reflectivity is possible.
An active hybrid system uses the piezoelectric actuators to input a controlled excitation to the structure and fiber optic sensors to capture the corresponding structural response. The major advantages of the hybrid SHM system include: active damage detection, the best actuator/sensor decoupling (minimum interference between the actuation input signal and sensor output signal) and few transmission losses during its optical signal nature.
Aims of the projects:
- Damage detection, identification and residual strength evaluation
- Optimization procedure to define the proper SHM design for a structure
- Investigations on complex structures
- Performance of intelligent structures
(Project partly funded by DAAD Matching Funds Program)
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