• Laser & Optoelectronics Progress
  • Vol. 60, Issue 11, 1106033 (2023)
Zegong Wu1, Lu Cao2, Yanong Ning2, Qingshan Yang2, and Tongyu Liu1、2、*
Author Affiliations
  • 1Laser Institute, Shandong Academy of Sciences, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250104, Shandong, China
  • 2Shandong Micro-Sensor Photonics Ltd., Jinan 250103, Shandong, China
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    DOI: 10.3788/LOP222686 Cite this Article Set citation alerts
    Zegong Wu, Lu Cao, Yanong Ning, Qingshan Yang, Tongyu Liu. Roof Separation Sensor Based on Fiber Bragg Grating[J]. Laser & Optoelectronics Progress, 2023, 60(11): 1106033 Copy Citation Text show less

    Abstract

    This study investigates a roof separation sensor based on fiber Bragg grating. Simple structure, easy installation, and low cost are the advantages of this fiber optic sensor. This sensor does not exhibit charged characteristics, and it is suitable for coal mine applications. The sensor consists of mechanical structures and shifts the displacement of a wire rope through the rotation of multiple mechanical structures. Thus, it is convenient to use the wire rope to connect to the roof separation and vary the range and sensitivity. The sensor has three fiber gratings, which not only satisfies the requirements for monitoring multiple points but also provides a method for eliminating the temperature effects. The experimental results verify the reliable linearity of the sensor at multiple temperatures, and the accuracy can reach ±2 mm with a range of up to 300 mm.
    λB=2neffΛ
    ΔλB/λB=kεΔε+kTΔT
    Δx=(λa1-λa0)-(λb1-λb0)k3/k2k1
    l=np
    ε=kl
    Δε1=kpΔn
    Δε1=kpΔs/πd
    Zegong Wu, Lu Cao, Yanong Ning, Qingshan Yang, Tongyu Liu. Roof Separation Sensor Based on Fiber Bragg Grating[J]. Laser & Optoelectronics Progress, 2023, 60(11): 1106033
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