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Influences of relative humidity and temperature on PMMA based fiber Bragg gratings (FBGs) are systematically studied. First, we have found that relative humidity exhibits much significant influence on the Bragg wavelength. An increase of 1% in relative humidity leads to a shift of 66 pm of Bragg wavelength centered at 1301 nm at 20 C, while 1 C increase in temperature only results...
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