SIGNAL RECOVERING IN FIBER OPTIC SENSORS BASED ON NONLINEAR FMCW TECHNIQUE

The operation of fiber optic sensor with nonlinear FMCW signal and Fab ry-Perot interferometer as an optical transducer is described. The sen sor's output is defined by the spectral response of the interferometer and does not depend on light intensity fluctuations in the fiber opti c link. The proposed processing technique eliminates the parasitic inf luence of external temperature variations on the output signal and avo ids the strong requirements on the stability of LD output spectral cha racteristics. The method doesn't need single-mode optical fibers.