조명전기설비학회논문지 (Journal of the Korean Institute of Illuminating and Electrical Installation Engineers)

  • 제26권2호
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  • Pages.44-50
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  • 2012
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  • 1229-4691(pISSN)
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  • 2287-5034(eISSN)
한국조명전기설비학회 (The Korean Institute of IIIuminating and Electrical Installation Engineers)
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광섬유 사낙간섭계에 삽입된 광섬유격자센서와 음향센서의 복조

Demodulation of FBG and Acoustic Sensors Embedded in a Fiber-Optic Sagnac Loop

  • 투고 : 2011.12.01
  • 심사 : 2012.02.02
  • 발행 : 2012.02.29
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초록

When the fiber Bragg gratings are embedded in a fiber-optic Sagnac loop for measuring temperature or strain, it is difficult to separate the Bragg wavelengths. The transmitted light is mixed with the reflected Bragg wavelengths in the photo-detector, working as noises. To suppress the noises, we placed the FBG sensors and a fiber-optic attenuator at asymmetric positions in the loop. With the arrangement the reflected light became much bigger than the transmitted light, enabling the separation of the reflected Bragg wavelengths with almost the same signal-to-noise ratio of the FBG sensors outside the loop.

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