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Sensors 2016, 16(12), 2087; doi:10.3390/s16122087

A Portable Array-Type Optical Fiber Sensing Instrument for Real-Time Gas Detection

1
Department of Automatic Control Engineering, Feng Chia University, Taichung 40724, Taiwan
2
Facilities Management Center, Feng Chia University, Taichung 40724, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: W. Rudolf Seitz
Received: 27 October 2016 / Revised: 30 November 2016 / Accepted: 5 December 2016 / Published: 8 December 2016
(This article belongs to the Section Chemical Sensors)
View Full-Text   |   Download PDF [8289 KB, uploaded 8 December 2016]   |  

Abstract

A novel optical fiber array-type of sensing instrument with temperature compensation for real-time detection was developed to measure oxygen, carbon dioxide, and ammonia simultaneously. The proposed instrument is multi-sensing array integrated with real-time measurement module for portable applications. The sensing optical fibers were etched and polished before coating to increase sensitivities. The ammonia and temperature sensors were each composed of a dye-coated single-mode fiber with constructing a fiber Bragg grating and a long-period filter grating for detecting light intensity. Both carbon dioxide and oxygen sensing structures use multimode fibers where 1-hydroxy-3,6,8-pyrene trisulfonic acid trisodium salt is coated for carbon dioxide sensing and Tris(2,2′-bipyridyl) dichlororuthenium(II) hexahydrate and Tris(bipyridine)ruthenium(II) chloride are coated for oxygen sensing. Gas-induced fluorescent light intensity variation was applied to detect gas concentration. The portable gas sensing array was set up by integrating with photo-electronic measurement modules and a human-machine interface to detect gases in real time. The measured data have been processed using piecewise-linear method. The sensitivity of the oxygen sensor were 1.54%/V and 9.62%/V for concentrations less than 1.5% and for concentrations between 1.5% and 6%, respectively. The sensitivity of the carbon dioxide sensor were 8.33%/V and 9.62%/V for concentrations less than 2% and for concentrations between 2% and 5%, respectively. For the ammonia sensor, the sensitivity was 27.78%/V, while ammonia concentration was less than 2%. View Full-Text
Keywords: optical fiber array; Bragg grating; long-period fiber sensing; optical polishing; fluorescence reaction; gases measurement optical fiber array; Bragg grating; long-period fiber sensing; optical polishing; fluorescence reaction; gases measurement
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Hung, S.-S.; Chang, H.-C.; Chang, I.-N. A Portable Array-Type Optical Fiber Sensing Instrument for Real-Time Gas Detection. Sensors 2016, 16, 2087.

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