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논문 기본 정보
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- 학위논문
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- 2017
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An intensity-based fiber optic sensor (FOS) and its sensor head with self-referencing and multi-point sensing characteristics are proposed and demonstrated, and we discussed of the bridge and wind turbine blade strain measurement using the proposed FOS and its sensor head, which can be applied to the strain measurement.
A self-referencing intensity-based FOS which consists of broadband light source (BLS), optical circulator, fiber Bragg gratings (FBGs), optical coupler, tunable Fabry-Perot filter, photodiode module, and LabVIEW program is proposed and demonstrated. The theoretical analysis for the proposed scheme is given, and the validity of the theoretical analysis has been confirmed by experiments. We define the measurement parameter and the calibration factor to find the transfer function of the intensity-based FOS head.
The self-referencing characteristic for the proposed system is validated by showing that the measurement parameter is invariant for BLS optical power attenuations of 0, 3, 6, and 9 dB. Also, the proposed system has shown that the measurement parameter is irrelevant to the FBGs with different characteristics. This means that the proposed fiber optic sensor offers the flexibility for determining the FBGs needed for implementation. Also by connecting eight FBGs and six sensor heads which can be in remote sensing position as cascade and parallel form, we have demonstrated multi-point characteristics of the proposed FOS. Experimental results for the proposed FOS are in good agreement with a theoretical analysis for BLS optical power attenuations and for three FBG pairs with different characteristics.
The power-budget analysis and limitations of the measurement rates are discussed. The proposed FOS has several benefits; the self-referencing characteristic, offering the flexibility for determining the FBGs, and simple structure in terms of structure complexity, number of devices, and measuring procedure.
An experimental investigation of fiber optic sensor head based on twist dual cyclic bending loss is proposed and applied to the strain measurement for a wavelength of 1,550 nm. It consists of several steel wires and an optical fiber. The bending loss characteristics according to the distance between steel wires, wire radius, and number of steel wires are given via experiments. Experimental results can be used for manufacturing FRP intensity-based sensing element.
Two samples for seven cases of the intensity-based FOS heads using twist dual cycling bending loss are made with the FRP coupon. The manufactured FOS heads bending loss according to the tensile strain and the flexural strain were measured with using an universal testing machine. The bending loss characteristics according to the interval between steel wires, wire radius, and number of steel wires were given. From the tensile strain and the flexural strain tests, we can see the average sensitivities of the manufactured FOS heads increase with increasing steel wire radius, with increasing number of steel wires, and with decreasing the distance between steel wires. Experimental results show that the sensitivities and the lengths of the proposed FOS head with twist dual cycling bending structure could be adjustable by changing the steel wire radius, the number of steel wires, and the distance between steel wires.
The case of remote multi-point strain measurement in the bridge and the wind turbine blade with intensity-based FOS and its sensor head are discussed, which can be applied to the strain measurement such as bridges, dams, buildings, and wind turbine blades.
A self-referencing intensity-based FOS which consists of broadband light source (BLS), optical circulator, fiber Bragg gratings (FBGs), optical coupler, tunable Fabry-Perot filter, photodiode module, and LabVIEW program is proposed and demonstrated. The theoretical analysis for the proposed scheme is given, and the validity of the theoretical analysis has been confirmed by experiments. We define the measurement parameter and the calibration factor to find the transfer function of the intensity-based FOS head.
The self-referencing characteristic for the proposed system is validated by showing that the measurement parameter is invariant for BLS optical power attenuations of 0, 3, 6, and 9 dB. Also, the proposed system has shown that the measurement parameter is irrelevant to the FBGs with different characteristics. This means that the proposed fiber optic sensor offers the flexibility for determining the FBGs needed for implementation. Also by connecting eight FBGs and six sensor heads which can be in remote sensing position as cascade and parallel form, we have demonstrated multi-point characteristics of the proposed FOS. Experimental results for the proposed FOS are in good agreement with a theoretical analysis for BLS optical power attenuations and for three FBG pairs with different characteristics.
The power-budget analysis and limitations of the measurement rates are discussed. The proposed FOS has several benefits; the self-referencing characteristic, offering the flexibility for determining the FBGs, and simple structure in terms of structure complexity, number of devices, and measuring procedure.
An experimental investigation of fiber optic sensor head based on twist dual cyclic bending loss is proposed and applied to the strain measurement for a wavelength of 1,550 nm. It consists of several steel wires and an optical fiber. The bending loss characteristics according to the distance between steel wires, wire radius, and number of steel wires are given via experiments. Experimental results can be used for manufacturing FRP intensity-based sensing element.
Two samples for seven cases of the intensity-based FOS heads using twist dual cycling bending loss are made with the FRP coupon. The manufactured FOS heads bending loss according to the tensile strain and the flexural strain were measured with using an universal testing machine. The bending loss characteristics according to the interval between steel wires, wire radius, and number of steel wires were given. From the tensile strain and the flexural strain tests, we can see the average sensitivities of the manufactured FOS heads increase with increasing steel wire radius, with increasing number of steel wires, and with decreasing the distance between steel wires. Experimental results show that the sensitivities and the lengths of the proposed FOS head with twist dual cycling bending structure could be adjustable by changing the steel wire radius, the number of steel wires, and the distance between steel wires.
The case of remote multi-point strain measurement in the bridge and the wind turbine blade with intensity-based FOS and its sensor head are discussed, which can be applied to the strain measurement such as bridges, dams, buildings, and wind turbine blades.
목차
- 목차 i그림차례 iv표 차례 viiAbstract viiiNomenclature xi제1장 서론 1제2장 구조물 스트레인 측정 62.1 스트레인 측정 방법 62.1.1 스트레인 게이지 센서 72.1.2 음향방출 센서 82.1.3 PZT 센서 102.1.4 광섬유 FBG 센서 112.2 광세기 기반 광섬유 센서 142.2.1 연속 순환 광섬유 루프를 이용한 광섬유 센서 152.2.2 연속 주파수 변조 부반송파를 이용한 광섬유 센서 162.2.3 두 주파수 변조와 링 공진기를 이용한 광섬유 센서 172.2.4 두 주파수 변조된 광의 위상 차이를 이용한 광섬유 센서 18제3장 제안한 광세기 기반 자기기준 광섬유 센서 193.1 광세기 기반 자기기준 광섬유 센서 동작 원리 193.2 광세기 기반 자기기준 광섬유 센서 구현 및 측정 253.2.1 광섬유 센서 구현을 위한 LabVIEW 프로그램 273.2.2 자기기준 특성 313.2.3 원격 측정 특성 333.2.4 임의의 규격을 가진 FBG를 이용한 측정 353.2.5 다지점 측정 373.2.6 광섬유 센서의 파워 수요예측 403.3 정적 및 동적 스트레인 측정 433.3.1 정적 스트레인 측정 443.3.2 동적 스트레인 측정 46제4장 광세기 기반 광섬유 센서 헤드 설계 및 제작 494.1 광세기 기반 광섬유 센서 헤드 연구 배경 504.2 이중 왕복 꼬임 광섬유 센서 헤드 534.2.1 동작원리 554.2.2 이중 왕복 꼬임 벤딩 구조 손실 특성 604.3 스트레인 측정을 위한 광세기 기반 광섬유 센서 헤드 694.3.1 FRP 복합재료 시편 제작 694.3.2 FRP 시편 스트레인 측정을 위한 이중 왕복 꼬임 벤딩 손실 구조 724.4 인장 스트레인 실험 764.5 3점 굴곡 실험 86제5장 구조물 원격 다지점 스트레인 측정 1005.1 구조물 원격 다지점 스트레인 측정 필요성 1015.2 광세기 기반 자기기준 광섬유 센서 특성 1035.3 교량 원격 다지점 스트레인 측정 예시 1055.4 풍력발전 블레이드 다지점 스트레인 측정 예시 110제6장 결론 115참고문헌 119
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