| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Optical fiber FBG linear sensing systems for the on-line monitoring of airborne high temperature air duct leakage |
| Qinyu Wang(王沁宇)1, Xinglin Tong(童杏林)2,†, Cui Zhang(张翠)2, Chengwei Deng(邓承伟)2, Siyu Xu(许思宇)2, and Jingchuang Wei(魏敬闯)2 |
1 School of Information Engineering, Wuhan University of Technology, Wuhan 430070, China;
2 National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, China |
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Abstract Electrical sensing systems, such as those involving eutectic salt, are mostly used in connection to leakage from existing airborne high-temperature air-conducting pipelines. Such complex structured systems are susceptible to external interferences and, thus, cannot meet the increasingly strict monitoring needs of a complex air-conducting pipeline system of an aircraft. In view of this point, this paper studies an alternative sensor system based on a dense array fiber grating. To obtain a compact and light-weight airborne signal processing system, a field programmable gate array is used as the main control core that controls the output of the light source. The functions of pulse modulation, analog-to-digital conversion, data buffering and transmission are integrated into a single system, while the linear sensing monitoring is obtained by detecting the time-division and wavelength-division wavelength drift signals of the fiber Bragg grating array. Our experiments show that the spatial resolution of the linear sensing system approaches 5 cm, the temperature measurement accuracy reaches 2 ℃, the temperature measurement range is between 0-250 ℃, and the response time is within 4 s. Compared with the existing electrical monitoring systems, various monitoring indicators have been greatly improved and have broad application prospects.
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Received: 08 October 2021
Revised: 16 February 2022
Accepted manuscript online: 25 February 2022
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PACS:
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42.81.-i
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(Fiber optics)
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42.81.Cn
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(Fiber testing and measurement of fiber parameters)
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42.55.Wd
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(Fiber lasers)
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07.60.Vg
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(Fiber-optic instruments)
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Corresponding Authors:
Xinglin Tong
E-mail: tongxinglin@whut.edu.cn
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Cite this article:
Qinyu Wang(王沁宇), Xinglin Tong(童杏林), Cui Zhang(张翠), Chengwei Deng(邓承伟), Siyu Xu(许思宇), and Jingchuang Wei(魏敬闯) Optical fiber FBG linear sensing systems for the on-line monitoring of airborne high temperature air duct leakage 2022 Chin. Phys. B 31 084204
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