Theoretical Modeling of Signal Loss versus Crack Opening for a Novel Crack Sensor

Leung, Christopher Kin Ying; Olson, Noah G.; Wan, Kai Tai; Meng, Aidong

doi:10.1061/(asce)0733-9399(2005)131:8(777)

Cited by 24 publications

(19 citation statements)

References 15 publications

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“…Its analysis approach mainly is transforming the curved waveguide into an equivalent straight waveguide with a modified refractive index profile by conformal transformation [17,18]. However, its numerical error tends to cumulate [16].…”

Section: Modified Optic Theoretical Analysis Methods Of Opticfiber Cramentioning

confidence: 99%

Theoretical analysis and experiment of micromechanics and mechanics-optics coupling of distributed optic-fiber crack sensing

Hao-wu

Chen

Sun

et al. 2011

Sci. China Technol. Sci.

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The micromechanical behaviors and mechanics-optics coupling effects of optic-fiber-concrete complex in the distributed optic-fiber sensing concrete-crack technology, which was used in health monitoring of Wu Gorge Bridge on Yangtze River and a large dam successfully, have been investigated. A micromechanical theoretical analysis method and micromechanical frictional contact bi-interface model, as well as a modified optical theoretical analysis method of the mechanics-optics coupling effects are presented. A series of verification experiments, including mechanical experiments and mechanics-optics coupling experiments, have been preformed. The results of micromechanical theoretical analysis and the analysis of the modified theory of mechanics-optics coupling along with mechanical and optical experimental data are shown to be in close agreement. Both the micromechanical theory and the modified theory of mechanics-optics coupling with their analysis methods can not only enhance credibility of this novel distributed sensing technology but also provide a way to understand its sensing mechanism and optimize its technical details and system. optic-fiber sensing, mechanics-optics coupling, micromechanics, health monitoring, concrete structure, crack detection Citation:Liu H W, Chen J, Sun M, et al. Theoretical analysis and experiment of micromechanics and mechanics-optics coupling of distributed optic-fiber crack sensing.

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Section: Modified Optic Theoretical Analysis Methods Of Opticfiber Cramentioning

confidence: 99%

Theoretical analysis and experiment of micromechanics and mechanics-optics coupling of distributed optic-fiber crack sensing

Hao-wu

Chen

Sun

et al. 2011

Sci. China Technol. Sci.

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show abstract

“…The DOFS can be used to satisfy many specific engineering demands, where there are a large number of continuously distributed parameters in the engineering structures that must be measured. The development of fiber optic smart structures and crack monitoring of DOFS further accelerates the engineering application of DOFS [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Experimental research on distributed fiber sensor for sliding damage monitoring

Guo

Wang

Liu

2009

Optics and Lasers in Engineering

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“…Recently, many researchers try to monitor the crack by different techniques [1][2][3]. In our former work [4][5][6][7][8], a distributed fiber optic sensor has been developed for the detection and monitoring of cracks in pure opening mode (or Mode I in fracture mechanics terminology) without requiring prior knowledge of crack locations. The sensing principle is based on the bending loss of an optical fiber that intersects an opening crack at an angle other than 90 • .…”

Section: Introductionmentioning

confidence: 99%

“…By monitoring the bending loss along the fiber with an optical time domain reflectometer (OTDR), both the crack location and its opening can be obtained. The feasibility of the sensing approach has been verified through experiments and a theoretical model has been developed to provide guidelines for sensor design [6]. While the sensor is originally developed for * Corresponding author.…”

Section: Introductionmentioning

confidence: 99%