Method and device for identifying designated materials in the composition of an object
First Claim
1. A method for identifying at least one specific target material in the constitution of an object (1),characterized in that it comprises the following stages:
- A. Previously determining the attenuation function across a wide x-ray spectrum of at least two reference materials and therefrom deriving base-forming projection functions (Fp1,Fp2 . . . ),B. During a second preliminary stage, deter the attenuation of at least one target material across said x-ray spectrum and projecting the attenuation function of each target material onto said base,C. For each point of the object (1),determining the attenuation function of the object (1) for said x-ray spectrum,projecting the attenuation function of the object (1) onto said basecomparing the projections so obtained with the projections from each target material and deducing from this comparison whether at least one target material is pant of the constitution of the object (1) at the point being tested.
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Accused Products
Abstract
The method comprises the following stages: first the attenuation function of at least three reference materials are determined across a wide x-ray spectrum and projection functions (Fp1, Fp2, Fp3, Fp4) forming a base are derived therefrom, then the attenuation function in said x-ray spectrum of at least one target material is determined and the attenuation function of each target material is projected onto said base; further, for each point of the object (1), the attenuation function of the object (1) is determined in said x-ray spectrum and projected onto said base, and the projections so obtained are compared with the projection from each target material and from this comparison an inference is made whether at least one target material enters the constitution of the object (1) at the point of inspection.
Application: luggage inspection and control.
220 Citations
18 Claims
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1. A method for identifying at least one specific target material in the constitution of an object (1),
characterized in that it comprises the following stages: -
A. Previously determining the attenuation function across a wide x-ray spectrum of at least two reference materials and therefrom deriving base-forming projection functions (Fp1,Fp2 . . . ), B. During a second preliminary stage, deter the attenuation of at least one target material across said x-ray spectrum and projecting the attenuation function of each target material onto said base, C. For each point of the object (1), determining the attenuation function of the object (1) for said x-ray spectrum, projecting the attenuation function of the object (1) onto said base comparing the projections so obtained with the projections from each target material and deducing from this comparison whether at least one target material is pant of the constitution of the object (1) at the point being tested. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification