Electrical sensing systems,such as those involving eutectic salt,are mostly used in connection to leakage from ex-isting 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 experi-ments 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.

Qinyu Wang;Xinglin Tong;Cui Zhang;Chengwei Deng;Siyu Xu;Jingchuang Wei

School of Information Engineering,Wuhan University of Technology,Wuhan 430070,China;National Engineering Laboratory for Fiber Optic Sensing Technology,Wuhan University of Technology,Wuhan 430070,China

中国物理B（英文版）

[1]Qinyu Wang;Xinglin Tong;Cui Zhang;Chengwei Deng;Siyu Xu;Jingchuang Wei-.Optical fiber FBG linear sensing systems for the on-line monitoring of airborne high temperature air duct leakage)[J].中国物理B（英文版）,2022(08):458-465

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