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Fiber Bragg gratings (FBG's) have been used as communication devices and sensors in applications. To extent the FBG's ability for the uniform distributed disturbances, this study computed reflection spectra of an apodized FBG subjected to strain gradients ranging from 0 to 1 strain/m. Based on the coupled-mode theory, in this paper reflection spectra and their corresponding areas were calculated....
This study conducted computations and experiments to demonstrate the relationship between areas of reflection spectra and strain gradient chirps along a fiber grating. Previous studies have shown that strain gradient chirps on an FGB lead to distortions on its reflection spectrum. However, in applications, how to use a practical measurand (obtained directly from an FBG) to deduce the strain gradient...
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