본 논문에서는 극저온 설비의 정밀한 온도 모니터링을 위해 광섬유 격자(Fiber Bragg Grating, FBG) 센서의 패키징 조건에 따른 센싱 특성을 비교 분석하였다. 상온(23°C)과 액체질소(-196°C) 환경을 오가는 실험을 통해 광섬유 및 코팅 재질, 보호 튜브 종류에 따른 온도 민감도와 응답 특성을 평가하였다. 실험 결과, 폴리이미드(Polyimide) 코팅된 퓨어 실리카(Pure Silica) 광섬유 기반 FBG 센서가 아크릴레이트(Acrylate) 코팅된 일반 단일모드 광섬유 기반 FBG 센서보다 극저온에서 약 26% 더 높은 파장 변화율(온도 민감도)을 나타냈다. 또한 보호 패키징 재질의 경우, Stainless Steel(SUS)보다 PTFE(Polytetrafluoroethylene) 튜브를 적용했을 때 열적 응답 속도가 더욱 향상됨을 확인하였다. 본 연구 결과는 향후 LNG·액화수소 저장 시설 및 초전도 기기 등 극저온 환경용 고성능 광섬유 센서 시스템 설계의 기초 자료로 활용될 수 있을 것으로 기대된다.
KSP Keywords
Fiber bragg grating, Stainless steel(SUS316)
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