Highly sensitive evanescent-wave water salinity sensor realized with rectangular optical microfiber Sagnac interferometer

Chuang Wu; Lipeng Sun; Jie Li; Bai-Ou Guan

doi:10.1117/12.2059626

2 June 2014 Highly sensitive evanescent-wave water salinity sensor realized with rectangular optical microfiber Sagnac interferometer

Chuang Wu, Lipeng Sun, Jie Li, Bai-Ou Guan

Author Affiliations +

Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 915758 (2014) https://doi.org/10.1117/12.2059626
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain

Abstract

We demonstrated a highly sensitive evanescent-wave-based water salinity sensor using a rectangular optical microfiber Sagnac interferometer. The microfiber has a rectangular cross-section with widths of 4.0 μm by 2.5 μm and total length of 36 mm. For water salinity from 0‰ to 40‰, a high sensitivity of 1.95 nm/(1‰) was achieved at the wavelength of 1550 nm, indicating a detection limit of 0.01‰. The proposed sensor has advantages of high sensitivity, compact size, ease for fabrication, and potentially low-cost. It is very useful for undersea applications and manufacture process controlling where monitoring small change in water salinity is required.

Citation Download Citation

Chuang Wu, Lipeng Sun, Jie Li, and Bai-Ou Guan "Highly sensitive evanescent-wave water salinity sensor realized with rectangular optical microfiber Sagnac interferometer", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 915758 (2 June 2014); https://doi.org/10.1117/12.2059626

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