中国物理B ›› 2022, Vol. 31 ›› Issue (8): 84204-084204.doi: 10.1088/1674-1056/ac5889

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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. 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
  • 收稿日期:2021-10-08 修回日期:2022-02-16 接受日期:2022-02-25 出版日期:2022-07-18 发布日期:2022-07-23
  • 通讯作者: Xinglin Tong E-mail:tongxinglin@whut.edu.cn

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. 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
  • Received:2021-10-08 Revised:2022-02-16 Accepted:2022-02-25 Online:2022-07-18 Published:2022-07-23
  • Contact: Xinglin Tong E-mail:tongxinglin@whut.edu.cn

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摘要： 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.

关键词: gating array, quasi-distributed measurement, temperature monitoring, prague grating, miniaturization

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.

Key words: gating array, quasi-distributed measurement, temperature monitoring, prague grating, miniaturization

中图分类号:  (Fiber optics)

  • 42.81.-i
42.81.Cn (Fiber testing and measurement of fiber parameters) 42.55.Wd (Fiber lasers) 07.60.Vg (Fiber-optic instruments)