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Polarization-switching FBG interrogator for wavelength-encoded polarization-sensitive measurements

Orr, Philip and Niewczas, Pawel (2011) Polarization-switching FBG interrogator for wavelength-encoded polarization-sensitive measurements. In: 21st International Conference on Optical Fibre Sensors, 2011-05-15 - 2011-05-19.

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We present an FBG interrogation system incorporating a fast polarization selection mechanism that enables the independent detection of sensor responses to orthogonal polarizations. By configuring the polarization-switching subsystem in two example schemes - switching between either orthogonal linearly or circularly polarized FBG reflections - we demonstrate the system's capability to interrogate single transducers for both fiber bend and longitudinal strain, or for both magnetic field strength and temperature. With each embodiment the capability for serial multiplexing of sensors is retained. The technique allows magnetic field or bend to be measured using intrinsic multiplexable wavelength-encoded sensors, and will be applicable to a number of other polarization-dependent measurements such as electric field or transverse strain.