한국광학회지 (Korean Journal of Optics and Photonics)

  • 제26권2호
  • /
  • Pages.83-87
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  • 2015
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  • 1225-6285(pISSN)
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  • 2287-321X(eISSN)
한국광학회 (Optical Society of Korea)
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광반응 재료가 코팅된 단주기 광섬유격자 기반 자외선센서의 광민감도 향상 연구

Improving the Sensitivity of an Ultraviolet Optical Sensor Based on a Fiber Bragg Grating by Coating With a Photoresponsive Material

  • 김우영 (조선대학교 광기술공학과) ;
  • 김찬영 (조선대학교 광기술공학과) ;
  • 김현경 (조선대학교 생명화학고분자공학과) ;
  • 안태정 (조선대학교 광기술공학과)
  • Kim, Woo Young (Department of Photonic Engineering, Chosun University) ;
  • Kim, Chan-Young (Department of Photonic Engineering, Chosun University) ;
  • Kim, Hyun-Kyoung (Department of Biochemical & Polymer Engineering, Chosun University) ;
  • Ahn, Tae-Jung (Department of Photonic Engineering, Chosun University)
  • 투고 : 2014.10.06
  • 심사 : 2015.01.05
  • 발행 : 2015.04.25
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초록

본 논문은 자외선 광학센서 개발에 관한 것이다. 기존에 반도체 기반 자외선 센서를 대체하기 위해 개발된 단주기 광섬유격자기반 자외선 센서에 대한 측정 민감도를 향상시키기 위한 다양한 장치들을 설계하고 실험을 통해 성능을 확인하였다. 최근 연구를 통해 자외선 흡수에 따라 인장력이 유도되는 아조벤젠 폴리머 재료와 장력에 따른 광섬유격자 특성 변화를 조합하여 새로운 자외선 센서의 개념이 제시되었다. 본 연구에서는 광섬유격자 기반 자외선 센서에서 흡수하지 못하고 통과되는 자외선 잔광을 반사판을 이용해서 다시 반사시켜 센서에서 재흡수되는 원리로 센서의 민감도를 향상시켰다. 본 논문에서는 반사판의 종류를 선정하고 반사판의 곡률반경을 최적화하였다. 또한 기존의 원통형 집광렌즈를 이용한 민감도 향상 기술을 접목 시켜 아무런 장치가 없을 때와 비교해서 약 15배의 성능을 향상시키는 결과를 얻었다. 또한 외부 환경 효과를 줄이기 위한 패키지 모듈을 제작하여 적용하고 그 특성을 분석하였다.

This study was focused on developing an optical sensor that monitors ultraviolet (UV) light. Recently, we proposed and demonstrated a novel, highly sensitive UV sensor based on a fiber Bragg grating (FBG). To ensure that the incident UV light is focused on the FBG surface, the sensor was coated with an azobenzene polymer material that acts as a UV-induced stretchable functional material, in combination with a cylindrical focal lens. In this study we have improved the sensitivity of the sensor by employing a cylindrical focal mirror as a curved reflector, to refocus the UV light passing through the FBG. We considered the performance of several different types of reflectors and chose the optimal radius of curvature for the reflector. Compared to the UV sensor without an auxiliary device, the sensitivity of the FBG sensor with a focal lens and a curved reflector was 15 times as high.

키워드

참고문헌

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