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Analysis of macro-strain transfer and complete strain state measurement with embedded fiber-optic sensors

Summarizes the normal strain coupling from an isotropic material into an embedded optical fiber which serves as a sensor. The sensor is based on single-mode polarization-maintaining fibers and is sensitive to all three normal strains. It is shown analytically that six such sensors can monitor the complete strain state of the host material provided that the sensor direction and polarization axes are properly orientated.