Abstract: We present a polarimetric and interferometric fiber-optic sensor systems employing highly birefringent fibers for stress monitoring in civil engineering applications. Both systems are designed to be used with concrete-embeddable pressure c ells, optimized for stress measurement inside a concrete medium and equipped with a direct read-out of its inside pressure using an internally incorporated all-fiber sensor. In its present form the polarimetric system contains up to four space division multiplexed sensors. An overall system accuracy, including temperature drift in a wide range of temperatures is better than 1% at pressures up to 40 MPa. A concept of coherence multiplexing was applied in the interferometric system. We built and tested the system composed of three serially connected temperature-compensated pressure sensors.!4
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