Detection of molecular oxygen by magnetic field interaction with guided light within an optical fiber

Florian V. Englich; Tanya M. Monro

doi:10.1117/12.973667

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17 October 2012 Detection of molecular oxygen by magnetic field interaction with guided light within an optical fiber

Florian V. Englich; Tanya M. Monro

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Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 84211T (2012) https://doi.org/10.1117/12.973667
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

Abstract

We report a novel fiber-optic sensing architecture for the detection of paramagnetic gases that exploits the interaction of a magnetic field with guided light to detect an active gaseous medium within a hollow-core photonic bandgap fiber. This first demonstration of a fiber-based Faraday Rotation Spectroscopy (FRS) sensor operates at 762.309 nm for the detection of molecular oxygen. The optical fiber sensor has a 14.8 cm long sensing region and 4.2 nL detection volume. A measured FRS spectrum with a signal-to-noise ratio of 9.5 proves the principle of this new gas sensor architecture.

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Florian V. Englich and Tanya M. Monro "Detection of molecular oxygen by magnetic field interaction with guided light within an optical fiber", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84211T (17 October 2012); https://doi.org/10.1117/12.973667