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A temperature-insensitive sensor for micro displacement measurement is proposed based on a novel packaging of an FBG. In this paper, an apodized fiber Bragg grating (FBG) was glued at the specific position on the inner surface of a thin-walled ring. When the ring is deformed, the FBG could be split into two segments of FBGs in the two identical but oppositely directed chirp gradients. In this way,...
The study on strain distribution of a thin-wall ring is presented and a bandwidth-demodulated displacement sensor based on a fiber Bragg grating (FBG) is proposed. The FBG is glued onto the inner surface of a spring steel ring, and it is found that its bandwidth is linearly changed with the displacement variation of the top point of the ring due to the ring-compression-induced gradient strain. The...
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