An optical-fiber Michelson interferometric acoustic emission sensor is described. The sensor uses ordinary singlemode fiber and is embedded in the composite material under test. Signals are demodulated through the active homodyne. This system provides a novel approach for material nondestructive evaluation.

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An optical fibre Michelson interferometer is embedded in Kevlar -epoxy composites for acoustic emission detection. Application of this sensor system to damage detection in composites is demonstrated.

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