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A curvature sensor based on fiber Bragg grating (FBG) is demonstrated in this paper. Two FBGs are surface-bonded on opposite sides of a flexible beam to track the local curvature variation. The bending-induced strain causes opposite changes in their Bragg wavelengths. As a result, temperature-independent curvature measurement with sensitivity of 3.21nm/mMIN1 is achieved by monitoring spacing between the two Bragg wavelengths. The experimental results agree well with the theoretical analysis.
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