Method to determine the phase composition of cement
AssigneeSchlumberger Technology Corporation
InventorsTrevor L. Hughes, Timothy G. J. Jones, Philip Fletcher
Life of this patent
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Abstract
A method of analysing the major and/or minor phase composition of a cement comprising a) preparing a calibration model from samples for which the phase composition has been determined and for which infra red spectra, typically Fourier transform infrared spectra, obtained by a diffuse reflectance technique, have been obtained so as to relate differences between spectra of the samples to differences in clinker phase composition of the samples; and b) obtaining the infra red spectrum of a sample of unknown phase composition and determining the phase composition of the sample from the calibration model typically using a multivariate statistical method.
Claims9
A method of analyzing the phase composition of a cement, the method comprising the steps of a) preparing a calibration model by relating measured infrared spectra of samples to the phase composition thereof so as to relate differences between spectra of the samples to differences in phase composition of the samples;
- and b) obtaining the infrared spectrum of a sample of unknown phase composition and comparing the spectrum with the calibration model so as to determine the phase composition of the sample, characterized in that the model relates the infrared spectra to the composition with regard to more than one phase of the samples, and the composition of the sample of unknown phase composition is determined with regard to said more than one phase quantitatively and simultaneously from the infrared spectrum.
Dependencies are inferred from the claim text.