Abstract
A technique that uses laser excited fluorescence in rare earth doped optical fibres to determine the location of structural damage is demonstrated. It has been shown experimentally that the position of a 'fracture' in a sensing erbium doped optical fiber can be evaluated by measuring the backward fluorescence power (BFP) from this erbium doped optical fiber (EDOF). This sensor can locate the position of fracture with a spatial accuracy of 3 mm within a gauge length of 0.43 m. A review of the theoretical basis for this sensing technique is provided and a discussion on optimization is presented.
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