2 June 2014 Hybrid Sagnac interferometer with high measurement resolution for simultaneous measurement of ambient index and temperature
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Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 91570T (2014) https://doi.org/10.1117/12.2058779
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain
Abstract
A simple technique for simultaneous measurement of the concentration of ethylene glycol and temperature by using a hybrid Sagnac interferometer is proposed and experimentally demonstrated. The hybrid Sagnac interferometer is configured by inserting a long-period fiber grating (LPFG) and a D-shaped polarization-maintaining fiber (PMF) into a Sagnac interferometer. By partially removing the cladding of the PMF, we make the Sagnac interferometer sensitive to ambient index by exposing the core region of the D-shaped PMF to external circumstance. The determinant of the sensitivity matrix of the proposed sensing probe is improved by using the negative temperature sensitivity of the LPFG.
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Oh-Jang Kwon, Oh-Jang Kwon, Young-Geun Han, Young-Geun Han, } "Hybrid Sagnac interferometer with high measurement resolution for simultaneous measurement of ambient index and temperature", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 91570T (2 June 2014); doi: 10.1117/12.2058779; https://doi.org/10.1117/12.2058779
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