Detecting Damage in Composites | Zendy

Anand Asundi | Zendy

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Detecting Damage in Composites

Author(s) -

Anand Asundi

Publication year - 1998

Publication title -

mechanical engineering

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.117

H-Index - 17

eISSN - 1943-5649

pISSN - 0025-6501

DOI - 10.1115/1.1998-jun-5

Subject(s) - materials science , optics , optical fiber , polarization (electrochemistry) , composite number , composite material , optical microscope , microscope , waveplate , polarimetry , single mode optical fiber , polarized light microscopy , laser , scanning electron microscope , scattering , chemistry , physics

Research shows that polarimetric optical-fiber sensors embedded in composite laminates can monitor structural integrity and detect damage while the structure remains in service. An experimental arrangement can be created to monitor strain in composite specimens. Light from a linearly polarized helium-neon laser is converted into circularly polarized light using a quarter-wave plate, and is coupled into a polarization-maintaining optical fiber with a microscope objective lens and three-axis positioner. In order to ensure that the intensity modulation was a maximum, the input beam was polarized at 45 degrees to the axes of the fiber. Although this study used polarization-maintaining fibers, similar results also have been seen for standard single-mode fibers.

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