Experimental study of liquid refractive index sensing based on a U-shaped optical fiber

Zhi Zhang; Haitao Yan; Liben Li; Ming Wang

doi:10.1117/12.2036774

20 December 2013 Experimental study of liquid refractive index sensing based on a U-shaped optical fiber

Zhi Zhang, Haitao Yan, Liben Li, Ming Wang

Proceedings Volume 9044, 2013 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 90440W (2013) https://doi.org/10.1117/12.2036774
Event: International Conference on Optical Instruments and Technology (OIT2013), 2013, Beijing, China

Abstract

A U-shaped optical fiber sensing system designed to measure the refractive index of liquid had been proposed. The sensing mechanism of U-shaped optical fiber was discussed. A general single-mode fiber was bent into U-shaped and partially cladding of U-shaped fiber was corroded by HF acid buffer solution. Powers of different diameters of U-shaped fibers had been measured by many experiments. The results showed that the diameter of U-shaped fiber cladding 40 μm and the diameter of U-shaped was 1 cm were suitable to measure liquid refractive index. Then, this U-shaped optical fiber was immersed in liquid, such as pure water, ethanol, acetone and isopropanol, respectively. The evanescent field of the U-shaped fiber should be modulated by the liquid. The optical signal in the U-shaped fiber was measured with the optical spectrum analyzers(OSA). Finally, the experimental results were analyzed, and the spectra in the air was selected as a reference. The relative intensity was obtained for the different liquid. These results showed that the relative intensity of the liquid had a good linear relationship. This sensing device could accurately demarcate refractive index of liquid. It is simple, low cost, and it can also be applied in measuring the level of liquid.

Citation Download Citation

Zhi Zhang, Haitao Yan, Liben Li, and Ming Wang "Experimental study of liquid refractive index sensing based on a U-shaped optical fiber", Proc. SPIE 9044, 2013 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 90440W (20 December 2013); https://doi.org/10.1117/12.2036774

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KEYWORDS

Refractive index

Liquids

Optical fibers

Cladding

Modulation

Water

Fiber optics sensors

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