An overview on high-resolution and fast interrogation of optical-fiber sensors
relying on laser reflection spectroscopy is given. Fiber Bragg-gratings (FBGs)
and FBG resonators built in fibers of different types are used for strain,
temperature and acceleration measurements using heterodyne-detection and optical
frequency-locking techniques. Silica fiber-ring cavities are used for chemical
sensing based on evanescent-wave spectroscopy. Various arrangements for signal
recovery and noise reduction, as an extension of most typical spectroscopic
techniques, are illustrated and results on detection performances are presented
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