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, 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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