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Abstract

In a method of analyzing a spectrally modulated light signal received from an interferometric transducer the value of an optical path difference associated with a parameter to be remotely sensed is encoded as a characteristic frequency of spectral modulation in the received light. The intensity of the received light is measured at a number of wavelengths within a selected range of wavelengths to obtain data defining a measured spectrum. Reference data is generated to represent a theoretical spectrum corresponding to a nominal optical path difference, the reference data being generated for a greater range of wavelengths than the selected range of wavelengths of the measured spectrum. The measured spectrum is correlated with successive portions of the reference data to identify a portion of the reference data exhibiting correlation with the measured spectrum, and an output signal is then generated which is representative of the location of the correlating portion within the wavelength range of the reference data. The method provides improved resolution for remote sensing of parameters such as pressure.

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