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Proceedings Paper

Detection of volatile organic compounds using an optical fiber sensor coated with a sol-gel silica layer containing immobilized Nile red
Author(s): Dejun Liu; Xiaokang Lian; Arun Kumar Mallik; Wei Han; Fangfang Wei; Jinhui Yuan; Chongxiu Yu; Gerald Farrell; Yuliya Semenova; Qiang Wu
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Paper Abstract

A simple volatile organic compound (VOC) sensor based on a tapered small core singlemode fiber (SCSMF) structure is reported. The tapered SCSMF fiber structure with a waist diameter of 7.0 μm is fabricated using a customized microheater brushing technique. Silica based material containing immobilized Nile red was prepared by a sol-gel method and was used as a coating applied to the surface of the tapered fiber structure. Different coating thicknesses created by a 2-pass and 4-pass coating process are investigated. The experiments demonstrate that both sensors show a linear response at different gas concentrations to all three tested VOCs (methanol, ethanol and acetone). The sensor with a thicker coating shows better sensitivities but longer response and recovery times. The best measurement resolutions for the 4-pass coating sensor are estimated to be 2.3 ppm, 1.5 ppm and 3.1 ppm for methanol, ethanol and acetone, respectively. The fastest response and recovery time of 1 min and 5 min are demonstrated by the sensor in the case of methanol.

Paper Details

Date Published: 23 April 2017
PDF: 4 pages
Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103232W (23 April 2017); doi: 10.1117/12.2263671
Show Author Affiliations
Dejun Liu, Dublin Institute of Technology (Ireland)
Xiaokang Lian, Dublin Institute of Technology (Ireland)
Arun Kumar Mallik, Dublin Institute of Technology (Ireland)
Wei Han, Dublin Institute of Technology (Ireland)
Fangfang Wei, Dublin Institute of Technology (Ireland)
Jinhui Yuan, Beijing Univ. of Posts and Telecommunications (China)
Chongxiu Yu, Beijing Univ. of Posts and Telecommunications (China)
Gerald Farrell, Dublin Institute of Technology (Ireland)
Yuliya Semenova, Dublin Institute of Technology (Ireland)
Qiang Wu, Northumbria Univ. (United Kingdom)
Dublin Institute of Technology (Ireland)
Beijing Univ. of Posts and Telecommunications (China)

Published in SPIE Proceedings Vol. 10323:
25th International Conference on Optical Fiber Sensors
Youngjoo Chung; Wei Jin; Byoungho Lee; John Canning; Kentaro Nakamura; Libo Yuan, Editor(s)

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