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.

Date Published: 5 October 2009
PDF: 4 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75032T (5 October 2009); doi: 10.1117/12.834173

Published in SPIE Proceedings Vol. 7503:
20th International Conference on Optical Fibre Sensors
Julian D. C. Jones, Editor(s)