Thinned fiber based Mach-Zehnder interferometer for measurements of liquid level and refractive index

Lecheng Li; Li Xia; Zhenhai Xie; Deming Liu

doi:10.1117/12.963736

7 November 2012 Thinned fiber based Mach-Zehnder interferometer for measurements of liquid level and refractive index

Lecheng Li, Li Xia, Zhenhai Xie, Deming Liu

Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 84217K (2012) https://doi.org/10.1117/12.963736
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

Abstract

A novel singlemode-multimode-thinned-singlemode (SMTS) fiber structure based Mach-Zehnder interferometer (MZI) is proposed for measurements of liquid level and refractive index (RI). We observe that the liquid RI information can be provided from the sensitivity of the interference peak shifts. Furthermore, by measuring the certain wavelength shift, the liquid level can be measured accordingly. A 9.00 mm-long thinned fiber with core/cladding diameters of around 4.5/80 μm is used. The wavelength of 1538.7228 nm exhibits a water level sensitivity of -175.8 pm/mm, and refractive index sensitivity of -1868.42 (pm/mm) / RIU, respectively. Moreover, the fabrication process is very simple and cost effective.

Citation Download Citation

Lecheng Li, Li Xia, Zhenhai Xie, and Deming Liu "Thinned fiber based Mach-Zehnder interferometer for measurements of liquid level and refractive index", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84217K (7 November 2012); https://doi.org/10.1117/12.963736

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