METHOD AND DEVICE FOR IDENTIFYING A MATERIAL BY THE SPECTRAL ANALYSIS OF ELECTROMAGNETIC RADIATION PASSING THROUGH SAID MATERIAL

摘要

The invention relates to a method for identifying a material, which comprises the following steps: measuring (200) a spectrum of electromagnetic radiation transmitted through the material to be identified; determining (202, 204) at least one energy band, referred to as a measurement band, and spectral coefficients of a comparison function in said measurement band, from the measured spectrum; estimating (PH1, PH2), using predetermined spectral coefficients, the nature and/or thickness of the material to be identified on the basis of a set of reference spectral parameters relating to reference thicknesses and/or materials and defined within reference bands. The estimation comprises at least the two following steps: previously selecting (208i, 208p) a plurality of reference thicknesses and/or materials, referred to as possible candidates, from a comparison of the spectral coefficients determined with at least one portion of the reference spectral parameters; and estimating (222) the nature and/or thickness of the material to be identified, from a comparison of the spectral coefficients determined with the spectral parameters of at least one portion of the possible candidates, in at least one energy band that is common to the reference bands of said at least one portion of the possible candidates and the measurement band.