Real-time structural integrity monitoring using a passive quadrature demodulated localized Michelson optical fiber interferometer capable of simultaneous strain and acoustic emission sensing

摘要

A Michelson Fibre optic sensor (MFOS) is described for in-situ strain and vibration monitoring as well as acoustic emission detection in composite material structures. The phase sensitive fibre optic sensor is localized, all-fibre, and intrinsic, The MFOS was successfully embedded in Kevlar/epoxy and graphite/epoxy thermosets as well as graphite/PEEK thermoplastic in order to perform local strain and vibration measurements at the lamina level. A technique allowing acoustic emission detection in parallel with strain and vibration monitoring is illustrated.