Method for fiber optic transmission of a special coded measurement

摘要

A method wherein two light fluxes I1 and I2, spectrally encoded by interspersing or alternating line frequency spectra, are transmitted through an optical fiber from a transducer to an evaluation unit which generates an indication signal in relation to the ratio of the optical power of the two light fluxes. Both light fluxes I1 and I2 are generated with distinctly different narrow-bandline structures of the spectral distribution of their optical powers with the spectral separation of adjacent lines of the two line fluxes being greater than the linewidth of these lines. The optical power of the spectrally interposed light fluxes I1 and I2 are measured individually after spectral separation by filters which are selected to the specific distribution of the light fluxes I1 and I2.