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4 December 1998 Multiplexing of white-light and polarimetric fiber optic sensors for application in engineering mechanics
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We present an interferometric and a polarimetric 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 cells optimized for stress measurement inside a concrete or soil medium. The concept of coherence multiplexing was applied in the interferometric system. Serial and serial-parallel configurations of this system were built and tested. In the serial configuration, four sensors were multiplexed, two for pressure and two for temperature measurement. In the serial-parallel configuration, eight sensors were multiplexed, four for pressure measurements and four for temperature measurements. In its present form, the polarimetric system employs a space-division multiplexing concept and it contains up to four pressure sensors. The overall accuracy of white-light and polarimetric systems, including temperature drift in a wide range of temperatures, is better than 1% at pressures up to 40 MPa.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wojtek J. Bock, Waclaw Urbanczyk, and Andrzej Barwicz "Multiplexing of white-light and polarimetric fiber optic sensors for application in engineering mechanics", Proc. SPIE 3491, 1998 International Conference on Applications of Photonic Technology III: Closing the Gap between Theory, Development, and Applications, (4 December 1998);

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