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광섬유 마이켈슨 센서에 의한 축소모형 강트러스 교량의 변형률 측정
권일범 ( Kwon Il-bum ),최만용 ( Choi Man-yong ),문한규 ( Moon Hahngue ) 한국구조물진단유지관리공학회 1998 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.2 No.1
The strains of a steel truss bridge, which was scaled down to 1/15 of the real bridge for the laboratory experiments, were measured to monitor the health status of the bridge by quadrature phase-shifted 3x3 fiber optic Michelson sensors. The fiber optic sensors and electrical strain gages were bonded on the surface of some frames to sense the strain pattern induced by the abnormal structural behavior. The fiber optic signals were immediately processed by personal computer for the strain determination. In order to confirm the strain sensitivity of the fiber optic sensors, these fiber optic strains were compared with the strains of the strain gages. The static behavior of the bridge was analyzed by finite element analysis with SaP2000. These unite element analysis results were compared with the structural strain pattern obtained by the electrical strain gages and were arranged with the database for the determination of the bridge health condition. It was shown that the breakage of some frames could be detected from the changes in strain pattern.
압전필름 센서에 의한 사각 중공 보의 변형률 분포 측정
권일범 ( Kwon Il-bum ),김치엽 ( Kim Chi-yeop ),최만용 ( Choi Man-yong ),문한규 ( Moon Hahngue ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.1
PVDF film sensors were applied to measure the distributed strain of 3 thin-walled rectangular beams. The strain calibration of this film sensor was performed by an aluminum beam test. 7 PVDF film sensors were attached on each thin-walled rectangular beam beside each conventional electronic strain gage. These beams were loaded under the 3 point bending test condition. The strains from the PVDF sensors were well correlated with those from the electric strain gages. The sound beam was shown as the symmetric strain distribution according to the beam length. However the strain distribution of the defected beam had changed from that of the sound beam. Therefore, the strain distribution change can be used as a parameter of structural integrity monitoring.
권일범 ( Kwon Il-bum ),박휘립 ( Park Philip ),허용학 ( Huh Yong-hak ),김동진 ( Kim Dong-jin ),이동춘 ( Lee Dong-chun ),홍성혁 ( Hong Sung-hyuk ),문한규 ( Moon Hahngue ) 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.3 No.1
Fiber optic sensors can be embedded in the structures to get the health information in the structures. The fiber sensor was constructed with 3x3 fiber couplers to sense the multi-point strains and failure instants. The 2 RC(reinforced concrete) beams were made to one of A type, one of B type beams. These beams were reinforced by the steel bars, and were experimented under the flexural loading. The behavior of the beams was simultaneously measured by the fiber optic sensors, electrical strain gages, and LVDT. The states of the beams were interpreted by these all signals. By these experiments, There were verified that the fiber optic sensors could measure the structural strains and failure instants of the RC beams. The fiber sensors were well operated until the failure of the beams. It was shown that the strains of the reinforcing steel bar can be used to monitor the health of the beams through the flexural test of RC beams. On the other words, the results were arrived that the two strains in the reinforcing bar measured at the same point can give the information of the structural health status. Also, the failure instants of beams were well detected from the fiber optic filtered signals.
구조물의 변형률 측정을 위한 3x3 광섬유 마이켈슨 센서의 신호처리
권일범,문한규 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
The measuring method of structural strain by a passive-demodulated fiber optic interferometric sensor was developed to implement the real-time monitoring of structural status. A 3x3 fiber optic Michelson interferometric sensor was constructed to sense the value and the direction of structural strain. This sensor was applied on the cantilevered aluminum beam to experiment the sensing of the structural deformation. The digital signal processing was programmed by LabVIEW to determine the structural strain from the fiber optic signals. This program was verified by various simulated fiber optic signals.