Journal of the Computational Structural Engineering Institute of Korea (한국전산구조공학회논문집)

Computational Structural Engineering Institute of Korea (한국전산구조공학회)
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Fundamental Experiment to Verify the Resolution of Hetero-core Fiber Optic Sensor for the Prestress Measurement

프리스트레스 측정을 위한 헤테로코어 광파이버 센서의 분해능 검증 기초실험

  • Park, Eik-Tae (Department of Civil Engineering, Pukyung National Univ) ;
  • Choi, Kwang-Su (Department of Civil Engineering, Pukyung National Univ) ;
  • Kim, Tae-Yang (Department of Civil Engineering, Pukyung National Univ) ;
  • Lee, Hwan-Woo (Department of Civil Engineering, Pukyung National Univ)
  • Received : 2018.07.12
  • Accepted : 2018.09.27
  • Published : 2018.10.31
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Abstract

This is the study for developing the hetero-core optical fiber sensors which are purpose to measure the prestress of PSC bridges during the life cycle period. The goal of this study is to improve the resolution of hetero-core sensors. As a result of the test, it is possible to measure the displacement in $2{\mu}m$ increments. In other words, if the length of the sensor module is 30cm, it is possible to measure the prestress variations in 0.2MPa increments at specified compressive strength of concrete(fck) of 40MPa by Hook's Law. So it can be useful for development of a sensor module measuring internal prestress measurement.

이 실험연구는 PSC 교량의 생애주기 프리스트레스 측정용 헤테로코어 광파이버 센서를 개발하기 위한 선행연구이며, 기존의 헤테로코어 변위센서의 정밀도를 향상하기 위한 실험이다. 실험결과 최대 $2{\mu}m$ 단위의 변위 변화량을 측정할 수 있었다. 즉, 변위측정 길이가 30cm의 센서모듈을 설계했을 때 설계기준압축강도(fck)가 40MPa인 경우 0.2MPa 단위의 응력변화를 측정이 가능함을 확인하였다. 따라서 본 실험의 결과는 향후 진행될 내부매립용 센서모듈 개발에 유용한 자료로 활용될 수 있을 것으로 판단된다.

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