Abstract
It is widely accepted that plastic optical fibers will have broad application prospect in the field of structural health monitoring because the fiber is not easy to break like silica optical fibers and it also has excellent characteristics such as large diameter, good toughness, high plasticity and low cost. In order to monitor the location, width and direction of cracks in concrete dam, quantitative crack monitoring method of concrete dam based on POF-OTDR is studied theoretically and experimentally. Firstly, mathmatical model of quantitative crack monitoring is established through a lot of model tests. Then double-POF crack monitoring method is presented and validated experimentally after analysing possible layout methods. Based on this interpretation, a reasonable POF network layout scheme for crack monitoring is proposed. Finally, network structure for a concrete arch dam is discussed based on numerical calculation.
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