Quasidistributed optical fiber sensing system to monitor the displacement of joints on the face slab of concrete-faced rockfill dams

Lin Cheng; Minghao Li; Yaming Li; Jie Yang

doi:10.1117/1.OE.58.1.016107

12 January 2019 Quasidistributed optical fiber sensing system to monitor the displacement of joints on the face slab of concrete-faced rockfill dams

Lin Cheng, Minghao Li, Yaming Li, Jie Yang

Author Affiliations +

Optical Engineering, Vol. 58, Issue 1, 016107 (January 2019). https://doi.org/10.1117/1.OE.58.1.016107

Abstract

We propose a quasidistributed optical fiber-sensing system based on optical time-domain reflectometry (OTDR). The quasidistributed optical fiber-sensing system can be used to monitor the joint opening displacement or crack opening displacement of the face slab of concrete-faced rockfill dams (CFRDs). The crack sensors, which are based on the sensing principle of linear macrobending loss of optical fiber, are connected in series in each optical fiber link. In addition, multiple links can be connected with a single OTDR to construct an integrated monitoring system. Hence, the quasidistributed system overcomes some drawbacks of the distributed monitoring system, such as limited measurement range, fragility of fibers attached to the structural surface, and the nonlinear relationship between displacement and macrobending loss of optical fiber. To develop an optimal design plan for the monitoring system, some experiments are conducted to verify the independence of crack sensors and the minimum length of the connecting fiber between sensors. The analysis of the experiment results positively supports the application of optical loss in real structural monitoring.

Citation Download Citation

Lin Cheng, Minghao Li, Yaming Li, and Jie Yang "Quasidistributed optical fiber sensing system to monitor the displacement of joints on the face slab of concrete-faced rockfill dams," Optical Engineering 58(1), 016107 (12 January 2019). https://doi.org/10.1117/1.OE.58.1.016107

Received: 20 October 2018; Accepted: 12 December 2018; Published: 12 January 2019

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