Method for analyzing an object by X-ray diffraction
AssigneeCommissariat A L'energie Atomique Et Aux Energies Alternatives
InventorsDamien Barbes, Caroline Paulus, Joachim Tabary
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Abstract
The invention is a method for analysing an object by x-ray diffraction spectroscopy, in which a spectroscopic detector comprising a plurality of adjacent pixels is placed facing an object irradiated by an x-ray beam. Each pixel is able to acquire an energy spectrum of radiation elastically scattered by the object, the radiation propagating in a direction making an acute angle to the propagation direction of the collimated beam. The method allows, on the basis of each measured spectrum, a nature of the materials composing various portions of the object to be determined.
Claims13
A Method for analysing an object comprising:
- a) placing the object facing an irradiation source emitting ionising electromagnetic radiation and irradiating the object using the irradiation source, through a first collimator, so as to form a collimated incident beam propagating towards the object along a propagation axis;
- b) placing a detector comprising a plurality of pixels, so that each pixel is configured to detect radiation scattered by the object thus irradiated, the scattered radiation propagating in a direction making an acute scattering angle to the propagation axis;
- c) acquiring, with a plurality of pixels of the detector, a scattering spectrum representative of an energy distribution of the scattered radiation, each scattering spectrum being associated with one pixel;
- d) decomposing the object into elementary volumes and associating, with each pixel, a spatial dispersion function representing a contribution of each elementary volume to the scattered radiation detected by each pixel;
- e) on the basis of the acquired scattering spectra and of the spatial dispersion functions associated with respective pixels, determining a scattering signature associated with each elementary volume, the signature being representative of a material forming the elementary volume;
- and
- f) on the basis of the scattering signatures associated with each elementary volume, estimating a nature of the material forming the various elementary volumes of the object;
- wherein:
- a second collimator is interposed between the object and the detector, the second collimator defining an aperture extending between the object and the detector, along a median axis that is inclined with respect to the propagation axis, so that at least one elementary volume emits scattered radiation, through the aperture, towards various pixels of the plurality of pixels;
- the method comprises determining, for each pixel, a spatial dispersion function;
- each spatial dispersion function being established with respect to elementary volumes;
- and
- each spatial dispersion function representing an intensity of radiation, reaching the pixel, the radiation being respectively scattered by the elementary volumes.
Dependencies are inferred from the claim text.