Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Characteristics of Thermal Coefficient of Fiber Bragg Grating for Temperature Measurement

온도 측정을 위한 광섬유 브래그 격자 센서의 온도 계수 특성 평가

  • Kim, Heon-Young (Dep. of Mechanical Engineering, Seoul Nat'l Univ. of Science and Technology) ;
  • Kang, Donghoon (Korea Railroad Research Institute) ;
  • Lee, Jin-Hyuk (Graduate School of Energy and Environment, Seoul Nat'l Univ. of Science and Technology) ;
  • Kim, Dae-Hyun (Dep. of Mechanical and Automotive Engineering, Seoul Nat'l Univ. of Science and Technology)
  • 김헌영 (서울과학기술대학원 기계공학과) ;
  • 강동훈 (한국철도기술연구원) ;
  • 이진혁 (서울과학기술대학교 에너지환경대학원) ;
  • 김대현 (서울과학기술대학교 기계.자동차공학과)
  • Received : 2013.04.12
  • Accepted : 2013.05.08
  • Published : 2013.08.01
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Abstract

A fiber Bragg grating sensor is considered a smart sensor that shows outstanding performance in the field of structural health monitoring (SHM). It has a powerful advantage, especially that of multiplexing, which enables several parameters to be sensed at multiple points by using a single optical fiber line. Among several parameters, the thermal expansion coefficient and thermo-optic coefficient are required to measure temperature. In previous studies, these were considered constant variables. This study shows that two parameters vary with temperature and newly proposes a temperature function for these two parameters. Specifically, these two parameters were defined as a single variable, and then, it was experimentally verified that this variable is a function of temperature. Finally, it was shown that temperature from RT to $100^{\circ}C$ was precisely measured by using the temperature function that was defined through the experiment.

광섬유 브래그 격자 센서는 최근 구조건전성평가 분야에서 가장 활발히 사용되는 지능형 센서 중의 하나이다. 특히 본 센서는 다양한 물리량들을 여러 지점에서 한 가닥의 광섬유로 측정할 수 있다는 장점을 갖고 있다. 이중 온도 측정을 위해서는 열팽창계수 및 열광학 계수의 사용이 필요하다. 대부분의 기존 연구에서는 이러한 물리량들을 상수값으로 가정하고 온도를 측정하였다. 본 논문에서는 FBG 센서의 온도 측정 실험을 통해 온도 변화와 관련된 두 계수가 일반적으로 사용되는 상수가 아닌 온도에 따라 변하는 변수임을 확인하였다. 최종적으로 광섬유 브래그 격자 센서의 이론에서 온도계수를 온도에 따른 함수식으로 새롭게 제안하고, 이 함수식을 이용해 상온에서 100도까지의 범위에서 정확한 온도 측정이 가능함을 확인하였다.

Keywords

References

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