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