Expert system for interpretation of x-ray diffraction spectra

Abstract An expert system for the automated qualitative and semi-quantitative interpretation of x-ray diffraction spectra is discussed. The database consists of a reduced spectra file connected with a screen file of the element combinations. The knowledge base contains fuzzy set rules for the interpretation of the signal positions, intensities and so-called forbidden spectra intervals, rules for the similarity and logical rules for necessary or forbidden elements. The latter information is obtained by the interpretation of emission spectral analysis. The semi-quantitative composition of mixtures is determined by a variation calculation of the ten best hits of references.