서지주요정보
광섬유 센서를 이용한 복합재 보의 변형률 측정 및 파손 검출 = Strain measurement and failure detection of composite beams using fiber optic sensors
서명 / 저자 광섬유 센서를 이용한 복합재 보의 변형률 측정 및 파손 검출 = Strain measurement and failure detection of composite beams using fiber optic sensors / 권일범.
저자명 권일범 ; Kwon, Il-Bum
발행사항 [대전 : 한국과학기술원, 1997].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8007196

소장위치/청구기호

학술문화관(문화관) 보존서고

DAE 97008

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

Fiber optic interferometric sensors were embedded in composite beams for structural health monitoring. The strain sensitivities were investigated for fiber optic Michelson sensor, extrinsic Fabry-Perot sensor and two mode elliptical core optical fiber sensor embedded in composites. The signal beating and drifting were appeared in the fiber optic Michelson signal. However such phenomena were not shown in the fiber optic extrinsic Fabry-Perot signal. The bending deformation and matrix cracking were investigated through four-point bending tests of cross-ply composite beams with the embedded fiber optic sensor. The failure instants of composite beams were detected using both a PZT sensor and a fiber optic sensor in order to investigate the fiber optic failure signals. The failure due to matrix cracks in a composite beam was confirmed by the edge replica method. The fiber optic failure signal acquired by AC triggering of digital storage oscilloscope were characterized by the time duration and maximum amplitude. The post-digital processing of the fiber optic signal was carried out to determine the strain and failure instants of composite beams. The failure instants were observed from the processed failure signal by high pass filtering. The initial failure strain of the composite beam was measured and processed from the fiber optic strain signal after low pass filtering. The passive demodulated fiber optic sensors, a 3x3 fiber optic Michelson sensor and a paired fiber optic Fabry-Perot sensor, were constructed to find the magnitude and direction of the strain from their fiber optic signals. The real-time digital processing algorithm, modified reference line crossing count method, was developed to determine the magnitude and direction of the strain from passive demodulated signals. The performance of this algorithm was tested by the fiber optic signals with beating, drifting and noise. The magnitude and direction of the strain were successfully determined from the passive demodulated fiber optic signals by this developed algorithm. The real-time operation of this algorithm for strain determination was verified by tensile test. Also, the acquisition algorithm of the high pass filtered fiber optic failure signals was programmed with LabVIEW virtual instrument. The operation of this data acquisition program was verified by the impact test of the cantilevered beam.

서지기타정보

서지기타정보
청구기호 {DAE 97008
형태사항 xii, 149 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : A, 변형률-광 텐서(Strain-optic tensor). - B, 광섬유 센서 구성시 주의할 점. - C, 향후 연구를 위한 제안
저자명의 영문표기 : Il-Bum Kwon
지도교수의 한글표기 : 홍창선
지도교수의 영문표기 : Chang-Sun Hong
학위논문 학위논문(박사) - 한국과학기술원 : 항공우주공학과,
서지주기 참고문헌 : p. 69-76
주제 구조 안전 모니터링
광섬유 마이켈슨 센서
광섬유 외부 패브리-패로 센서
변형률 감지도
파손 시점
초기 파손 변형률
$3 \times 3$ 광섬유 마이켈슨 센서
한쌍의 광섬유 외부 패브리-패로 센서
수동 변조 되풀이 신호
수정된 기준선 교차 계수 방법
Structural health monitoring
Fiber optic michelson sensor
Fiber optic extrinsic Fabry-Perot sensor
Strain sensitivity
Failure instants
Initial failure strain
$3 \times 3$ fiber optic michelson sensor
A paired fiber optic extrinsic Fabry-Perot sensor
Passive-demodulated signals
Modified reference line crossing count method
QR CODE qr code