Distributed optical fiber sensing of cracks in concrete

Haowu Liu; Zhohui Yang

doi:10.1117/12.318167

13 August 1998 Distributed optical fiber sensing of cracks in concrete

Haowu Liu, Zhohui Yang

Proceedings Volume 3555, Optical and Fiber Optic Sensor Systems; (1998) https://doi.org/10.1117/12.318167
Event: Photonics China '98, 1998, Beijing, China

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.318167

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