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16 November 2004 Torsion sensors based on the fiber optic Malus Fabry-Perot interferometer
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The combination of a Malus and Fabry-Perot interferometers using fiber optic devices has been proven useful to achieve an enhancement in sensitivity to measure changes in circular birefringence. This fiber optic Malus Fabry-Perot interferometer (FOMFPI) allows for the sensitive detection of changes in the polarization of the guided beam due to torsion applied to the fiber, owing to multiple passes of the beam through the sensing area. We present a theoretical analysis based on Jones calculus showing that it is possible to measure variations in circular birefringence of the fiber upon registering changes in the transmission through this arrangement. The matrix representation developed for the FOMFPI allows for the evaluation of its performance as a function of parameters such as mirror reflectivity and intra-cavity losses. Experimental results using both, bulk optical components and optical fibers, show that compared to single-pass polarimeter measurements, enhancement in sensitivity is effectively achieved. The dependence of the enhancement factor on the reflectivity of the mirrors is evaluated upon using mirrors with variable reflection coefficient. The performance of FOMFPIs using multimode and single-mode fibers is also investigated.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gilberto Basilio-Sánchez and Juan Hernández-Cordero "Torsion sensors based on the fiber optic Malus Fabry-Perot interferometer", Proc. SPIE 5579, Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers, (16 November 2004);


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