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Open AccessArticle

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
Sensors 2016, 16(12), 2087; https://doi.org/10.3390/s16122087
Received: 27 October 2016 / Revised: 30 November 2016 / Accepted: 5 December 2016 / Published: 8 December 2016
(This article belongs to the Section Chemical Sensors)
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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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. https://doi.org/10.3390/s16122087

AMA 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(12):2087. https://doi.org/10.3390/s16122087

Chicago/Turabian Style

Hung, San-Shan; Chang, Hsing-Cheng; Chang, I-Nan. 2016. "A Portable Array-Type Optical Fiber Sensing Instrument for Real-Time Gas Detection" Sensors 16, no. 12: 2087. https://doi.org/10.3390/s16122087

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