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Optical Engineering

Fiber-optic sensor tip for measuring temperature and liquid refractive index
Author(s): Min Li; Yi Liu; Shiliang Qu; Yan Li
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Paper Abstract

A fiber sensor tip was proposed for measuring temperature and liquid refractive indices (RI). The sensor tip was fabricated by dipping a solidification ultraviolet (SU-8) photoresist onto the end surface of a simple-mode optical fiber. Then the SU-8 photoresist was cured by an ultraviolet source. A Fabry-Perot (FP) cavity was formed on the end faces of the SU-8 and optical fiber, and it showed a perfect FP interference spectrum. The temperature and liquid RI can be independently measured by monitoring the shift and the loss variation of interference peaks. The liquid RI sensitivity is 96.07232  dB/RIU in the RI range of 1.333 to 1.3714, and the temperature sensitivity is 0.38052  nm/°C within the temperature range from 25 to 55°C. The cross-sensitivities of temperature and liquid RI can be ignored. The sensor tip can be used in harsh environments, including strong acid, strong alkali, and violent vibration liquids, as cross-linking SU-8 has excellent chemical corrosion resistance capacity and mechanical strength.

Paper Details

Date Published: 13 November 2014
PDF: 5 pages
Opt. Eng. 53(11) 116110 doi: 10.1117/1.OE.53.11.116110
Published in: Optical Engineering Volume 53, Issue 11
Show Author Affiliations
Min Li, Harbin Institute of Technology in Weihai (China)
Yi Liu, Harbin Institute of Technology in Weihai (China)
Shiliang Qu, Harbin Institute of Technology in Weihai (China)
Yan Li, Harbin Institute of Technology in Weihai (China)


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