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Chin. Phys. B, 2022, Vol. 31(8): 084204    DOI: 10.1088/1674-1056/ac5889

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
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.
Keywords:  gating array      quasi-distributed measurement      temperature monitoring      prague grating      miniaturization  
Received:  08 October 2021      Revised:  16 February 2022      Accepted manuscript online:  25 February 2022
PACS:  42.81.-i (Fiber optics)  
  42.81.Cn (Fiber testing and measurement of fiber parameters)  
  42.55.Wd (Fiber lasers)  
  07.60.Vg (Fiber-optic instruments)  
Corresponding Authors:  Xinglin Tong     E-mail:

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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