Wavelength Shift Detection of Fiber Bragg Grating by Dynamic Strain using Serrodyne Modulation

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To evaluate the stability of man-made structures such as bridges, high-rise buildings and dams and of regions prone to dangers such as bedrock collapse, we are planning the construction of a health monitoring system using a fiber Bragg grating (FBG). In this paper we discuss the use of an FBG and serrodyne modulation to perform dynamic strain measurements in order to detect Bragg wavelength shifts in combination with an unbalanced Mach-Zehnder interferometer. When a Bragg wavelength shift is measured as a phase difference, the pseudo-heterodyne effects of serrodyne modulation are represented in terms of the frequency ratio and serrodyne coefficient. As the frequency ratio shifts away from unity, it causes non-linear changes in electrically measured phase, as has been demonstrated by experimental measurements of the shift in wavelength of a swept narrowband signal reflected by a fiber Bragg grating. The shift coefficients of FBG Bragg wavelengths measured in this apparatus matched the values measured with a wavelength resolution of 1×10<sup>-12</sup>m using an optical spectrum analyzer and an external cavity tunable diode laser, showing that the resolution of wavelength shift detection was 1×10<sup>-12</sup>m or less.

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  • 電気学会論文誌. E, センサ・マイクロマシン準部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A publication of Sensors and Micromachines Society  

    電気学会論文誌. E, センサ・マイクロマシン準部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A publication of Sensors and Micromachines Society 127(1), 1-6, 2007-01-01 

    The Institute of Electrical Engineers of Japan

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各種コード

  • NII論文ID(NAID)
    10018660292
  • NII書誌ID(NCID)
    AN1052634X
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13418939
  • NDL 記事登録ID
    8625921
  • NDL 雑誌分類
    ZN31(科学技術--電気工学・電気機械工業)
  • NDL 請求記号
    Z16-B380
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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