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13 August 1998 Distributed optical fiber sensing of cracks in concrete
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The monitoring of concrete cracks with optical fiber sensors is very attractive for large concrete structures, e.g. dams and bridges. Its distributed measurement capability is particular advantageous for application to detect the crack in concrete dams since it aries at random spatially. In this paper presented are the test result on a new type of the distributed optical-fiber sensor using common communication optical fibers with simple treatment. Sensing fiber is laid in concrete crossing obliquely with the crack expected. Cracking induces tow highly localized microbends and cause attenuation of returning Rayleigh scattering. Its distributed sensing is based on optical time domain reflectometry. Concrete model test show it can not only detect crack width and shear displacement with high resolution, large dynamic range but also localized them with high precision of localization. A calculation model of attenuation is presented. Also, given are typical proposal schemes of application of the optic-fiber sensing system to the Three Gorges Dam, China. The result afford a sound technique-bias for developing the practical distributed optic-fiber crack sensing system.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Haowu Liu and Zhohui Yang "Distributed optical fiber sensing of cracks in concrete", Proc. SPIE 3555, Optical and Fiber Optic Sensor Systems, (13 August 1998);

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