Abstract
In smart structures applications where fiber sensors are embedded within structural materials, multiple lead in/out fibers are preferred for redundancy and improving reliability. The use of only one lead/out fiber is not optimal because the breakage of fiber at one location due to for example local structural damage would cause the failure of the whole sensing system. The multiplexing and networking techniques suitable for such applications have attracted considerable research recently. In this paper, we summaries the results of our recent investigation on the bi-directional interrogation techniques (BDIT) for white light interferometric sensor arrays.
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