Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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Hydrogen Sensor Based on A Palladium-Coated Long-Period Fiber Grating Pair

  • Kim, Young-Ho (School of Information and Mechatronics, Gwangju Institute of Science and Technology) ;
  • Kim, Myoung-Jin (School of Information and Mechatronics, Gwangju Institute of Science and Technology) ;
  • Park, Min-Su (School of Information and Mechatronics, Gwangju Institute of Science and Technology) ;
  • Jang, Jae-Hyung (School of Information and Mechatronics, Gwangju Institute of Science and Technology) ;
  • Lee, Byeong-Ha (School of Information and Mechatronics, Gwangju Institute of Science and Technology) ;
  • Kim, Kwang-Taek (Department of Photonic Engineering, Honam University)
  • Received : 2008.10.27
  • Accepted : 2008.11.21
  • Published : 2008.12.25
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Abstract

We propose a simple hydrogen detection scheme based on a Mach-Zehnder interferometer formed with a pair of palladium-coated long-period fiber gratings (LPGs). Since an LPG pair offered a fine-structured interference fringe in its transmission spectrum, the resolution as a sensor could be appreciably enhanced compared to that of a single LPG. As the palladium layer absorbed hydrogen, the effective refractive indices of the cladding modes were increased so that the interference spectrum was blue-shifted up to 2.3 nm with a wavelength sensitivity of -0.29 nm/min for 4% of hydrogen concentration.

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References

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