대형선박의 액체 탱크용 수위 모니터링 센서 시스템 연구

다국어 초록 (Multilingual Abstract)

A fiber-optic liquid level sensor based on bending cantilever beam has been proposed. A fiber Bragg grating (FBG) embedded in the cantilever beam is used to sensing elements. The basic concept is elongation and constriction of the FBG corresponding to the liquid level variation. The best FBG position on the cantilever for obtaining the high sensitivity was 4 cm from the fixing point. When the liquid level moves up and down vertically, the Bragg wavelength is linearly shifted. But, the wavelength sensitivity of the FBG installed on the upper side of cantilever was four times better than that of the FBG equipped in the lateral side due to the difference of unit strain applied to the FBG. Intensity demodulation using the low-cost edge filter is used to interrogate the Bragg wavelength through converting the wavelength signals into the optical intensity ones. Experiment results show that the electrical output is exponentially proportional to the liquid level. But, it should be overcome for applying to the ships.

참고문헌 (Reference)

1 김진욱, "선박적용을 위한 광섬유 브래그 격가형 수위 모니터링 센서 시스템" 한국마린엔지니어링학회 167-168, 2008

2 T. Guo, "Temperature-insensitive fiber Bragg grating liquid-level sensor based on bending cantilever beam" 17 (17): 2400-2402, 2005

3 M. Lomer, "Lateral Polishing of bends in plastic optical fibers applied to a multipoint liquid-level measurement sensor" 137 : 68-73, 2007

4 C. Yang, "Fiber optical liquid level sensor under cryogenic environment" 94 : 69-75, 2001

5 J. A. Morris, "A digital fiber-optic liquid level sensor" LT-5 (LT-5): 920-925, 1987