Abstract
Based on white-light Michelson interferometric fiber optic sensing technique, a fiber optic two-dimensional (2-D) strain sensing system is presented. The system employs a light emitting diode (LED) as a broadband optical source and a single mode fiber that was fabricated in definite length as the strain sensor heads. The light signals are guided by the same lead in and lead out fiber, so the changing caused by the environmental temperature fluctuation of the fiber path can automatically be compensated. The two independent fiber optic strain sensors were embedded in the cubic concrete specimens along the main axial (horizontal) direction and the vertical direction. The sensor gauge length is 103 and 115 mm, respectively. And its resolution is about ±5 micro strain (μ ε ). It is in agreement with the conventional extensometer in the range of 0–6000 μ ε .
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