Passive, multiplexable measurement of magnetic field strength and temperature using PM fibre bragg gratings and chiral fibre devices

Orr, Philip and Niewczas, Pawel (2009) Passive, multiplexable measurement of magnetic field strength and temperature using PM fibre bragg gratings and chiral fibre devices. Proceedings of SPIE: The International Society for Optical Engineering, 7503. 75032T.

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Abstract

We present a solution to the simultaneous intrinsic point sensing of bi-directional magnetic field strength and temperature. Using a passive, retroactive method for polarisation selection based on a local chiral fibre device, a series of dual-wavelength fibre Bragg gratings written in polarisation-maintaining fibre may be interrogated for both measurands over long distance using linearly polarised light. Through simulation we identify and evaluate sources of error in the scheme in order to find the design that yields the optimal sensitivity and noise level, which for the multiplexing interferometric interrogator are 3.0 μrad/mT and 22 mT rms respectively at a rate of up to 10 kHz.