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The technique of film thickness estimation using water Raman signal suppression by an oil film has been improved. The new approach is based on the fact that the Raman backscattered signal of the water media under an oil film is distorted due to the wavelength-dependent absorption by oil in the spectral range corresponding to the measured Raman signal. The algorithm for estimating oil film thickness tested in this work involves calculating the amplitude ratio of two spectral components contributing to the water Raman spectrum.