Abstract
A novel interrogation method for optical fiber Bragg grating (FBG) sensors has been proposed by converting the change of the FBG wavelength into the phase difference between two radio frequency (RF) signals. As a result, the beating-induced RF signal power changes with the FBG wavelength shift. This technique could be used for high speed FBG interrogation and, due to the use of a second FBG to produce the reference RF signal, temperature cross-sensitivity effect is compensated automatically. Theoretical analysis and experimental demonstration have been carried out. Performances of the FBG sensor interrogation scheme have been studied.
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