Development and application of displacement-strain based integrated fiber optic sensor system for multiplexing and multi-parameter measurement in structural health monitoring = 구조 건전성 모니터링을 위한 변위-변형률 기반의 다점 및 다변수 측정 광섬유 센서 통합 시스템 개발과 응용

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Civil engineering structure health and usage monitoring systems (HUMS) are being developed to pre-vent unexpected accidents and to replace conventional maintenance services. In order to perform HUMS successfully in real applications, various sensors are installed at critical points of large size structures to moni-tor and diagnose the conditions of the structures. However, there are some disadvantages for the conven-tional electric-based sensors such as the addition of mass, wiring problems, and EMI (electromagnetic inter-ference). Thus, optical fiber-based sensors are being studied to overcome such existing problems of the conven-tional electric-based sensors. However, although the conventional optical fiber-based sensing systems are suitable for multiplexing, it presents still difficulties in performing multi-parameter measurements simultane-ously with multiplexing. Moreover, with the lack of an integrated system for multi-parameter measurement, various kinds of equipment are necessary, hence resulting in the critical problem of added weight to the struc-tures. To guarantee the accuracy and reliability of HUMSs in real applications, strain-displacement based multiplexing and multi-parameter measurements using integrated optical sensor systems are presented and developed in this study. First of all, two novel sensor principles are presented in order to resolve limitations in installation and complex cabling problems of the conventional transmission type grating based fiber optic sensors. The first sensor principle was realized using a reflective grating panel after investigation of the sensor signal characteristics according to the grating panel pattern. Based on the first sensor principle, a fiber optic accelerometer prototype was fabricated and investigated. Furthermore, in order to realize the proposed sensor principle as an accelerometer, a single degree of freedom system is developed. The appropriate leaf spring pattern is investigated for high sensitiv...
Advisors
Kim, Chun-Gonresearcher김천곤
Description
한국과학기술원 : 항공우주공학전공,
Publisher
한국과학기술원
Issue Date
2013
Identifier
513987/325007  / 020095117
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 항공우주공학전공, 2013.2, [ ix, 175 p. ]

Keywords

광섬유 가속도계; 구조건전성 모니터링; Impact source localization; Multiplexing; Multi-parameter; FOI; Single degree of freedom system; Fiber optic inclinometer; Fiber optic accelerometer; Fiber optic displacement sensor; HUMS; 광섬유 변위계; 광섬유 경사계; 단자유도 시스템; FBG센서; 다점측정; 광분기모듈; 충격위치; 파이프; FBG sensor

URI
http://hdl.handle.net/10203/179654
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=513987&flag=dissertation
Appears in Collection
AE-Theses_Ph.D.(박사논문)
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