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Study of macro-bending biconical tapered plastic optical fiber for relative humidity sensing

Zi Guo (School of Electronic and Information Engineering, Shanghai University of Electric Power, Shanghai, China)
Fenghong Chu (School of Electronic and Information Engineering, Shanghai University of Electric Power, Shanghai, China)
Jinyu Fan (School of Electronic and Information Engineering, Shanghai University of Electric Power, Shanghai, China)
Ze Zhang (School of Electronic and Information Engineering, Shanghai University of Electric Power, Shanghai, China)
Zhenglan Bian (School of Electronic and Information Engineering, Shanghai University of Electric Power, Shanghai, China)
Gaofang Li (School of Electronic and Information Engineering, Shanghai University of Electric Power, Shanghai, China)
Xiaojun Song (School of Electronic and Information Engineering, Shanghai University of Electric Power, Shanghai, China)

Sensor Review

ISSN: 0260-2288

Article publication date: 13 November 2018

Issue publication date: 17 May 2019

207

Abstract

Purpose

The purpose of this paper is to propose and optimize plastic optical fiber (POF) probe with macro-bending biconical tapered structure for the relative humidity (RH) sensing.

Design/methodology/approach

In this study, the principle is the evanescent wave power modulated by the ambient humidity. The probe is fabricated by using fused biconical taper and heat-setting method and then coated with a fluorescent moisture-sensitive film.

Findings

The probe’s sensing performance can be optimized by changing the probe’s curvature radius, biconical tapered transition length and taper waist diameter. The result shows that the sensitivity of the probe is up to 1.60 and 3.40 mV/ per cent, respectively, at low humidity (10-45 per cent) and high humidity (45-90 per cent). Also, this probe has good linearity, repeatability, photostability and long-term stability.

Practical implications

The proposed probe can improve the sensitivity and linearity of RH sensing without complex devices, which is necessary for mass production, remote measurement and convenient operation.

Originality/value

POF probe with macro-bending biconical tapered structure is investigated in this paper, which is proved to be effective in improving the sensitivity and linearity.

Keywords

Acknowledgements

This work was supported by Innovation Program of Shanghai Municipal Education Commission (15ZZ086), the Open Fund of the Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices (South China University of Technology), National Natural Science Foundation of China (Grant No. 61205081, 61401269, 11404207), Shanghai Natural Science Foundation (17ZR1411500) and Local colleges and universities capacity building Program (14110500900, 15110500900).

The author(s) of this article have not made their research dataset openly available. Any enquiries regarding the data set can be directed to the corresponding author.

Citation

Guo, Z., Chu, F., Fan, J., Zhang, Z., Bian, Z., Li, G. and Song, X. (2019), "Study of macro-bending biconical tapered plastic optical fiber for relative humidity sensing", Sensor Review, Vol. 39 No. 3, pp. 352-357. https://doi.org/10.1108/SR-03-2018-0058

Publisher

:

Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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