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This book is a collection of papers that originated as a Special Issue, focused on some recent advances related to fiber Bragg grating-based sensors and systems. Conventionally, this book can be divided into three parts: intelligent systems, new types of sensors, and original interrogators. The intelligent systems presented include evaluation of strain transition properties between cast-in FBGs and cast aluminum during uniaxial straining, multi-point strain measurements on a containment vessel, damage detection methods based on long-gauge FBG for highway bridges, evaluation of a coupled sequential approach for rotorcraft landing simulation, wearable hand modules and real-time tracking algorithms for measuring finger joint angles of different hand sizes, and glaze icing detection of 110 kV composite insulators. New types of sensors are reflected in multi-addressed fiber Bragg structures for microwave–photonic sensor systems, its applications in load-sensing wheel hub bearings, and more complex influence in problems of generation of vortex optical beams based on chiral fiber-optic periodic structures. Original interrogators include research in optical designs with curved detectors for FBG interrogation monitors; demonstration of a filterless, multi-point, and temperature-independent FBG dynamical demodulator using pulse-width modulation; and dual wavelength differential detection of FBG sensors with a pulsed DFB laser.

Fiber Bragg Grating (FBG) --- composite insulator with embedded FBGs --- glaze icing --- icing detection --- fiber Bragg grating strain sensor --- algorithm --- hand motion capture --- real-time tracking --- fiber Bragg gratings --- landing simulation --- rotorcraft --- coupled sequential method --- landing structural response --- finite element analysis (FEA) --- microwave-photonic sensor systems --- Fiber Bragg Gratings --- Addressed Fiber Bragg Structures --- Multi-Addressed Fiber Bragg Structures --- long-gauge FBG --- damage detection --- highway bridges --- vehicle–bridge interaction --- comparative study --- fiber Bragg grating --- fiber optic sensor --- dynamic chirp --- DFB laser --- chiral structures --- orbital angular momentum --- apodization --- chirp --- coupled modes theory --- FBG --- PWM --- engine --- high temperature --- ECU --- FBG demodulator --- fiber sensing --- high-speed interrogation --- dynamic strain --- microwave photonic sensor system --- numerical simulation --- addressed fiber Bragg structures --- load-sensing bearings --- vehicle dynamics control --- Fibre Bragg Gratings --- neutron diffraction --- X-ray tomography --- tensile test --- fiber Bragg grating sensors --- spectrograph --- high angular dispersion --- curved detectors --- freeform optics