Method and device for detecting a given material in an object using electromagnetic rays
First Claim
1. A method for detecting a specific material in an object using electromagnetic beams, whereby intensities of non-absorbed beams from at least three beam planes in corresponding detector arrays are measured and evaluated, said method comprising the steps of:
- a) generating at least a two-dimensional picture of the object from the measured intensity values;
b) selecting one of the spatial regions displayed in the picture on a basis of the value of a material value, which is determined from intensity measurements, for examination;
c) determining a first spatial-geometric value in the region to be examined from positional data of a two-dimensional picture and from intensity values using a stored value of a material-specific, absorption-influenced value of a suspected material;
d) determining a second spatial-geometric value solely from three-dimensional geometric values, which are determined from measured intensity values; and
e) comparing, directly or indirectly, the first spatial-geometric value with the second spatial-geometric value in order to determine if the suspected material is actually present.
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Accused Products
Abstract
A method for the detection of a specific material in an object (1), especially in a piece of luggage, using electromagnetic beams, whereby the intensities of non-absorbed beams from at least three beam planes (5.1–5.2) in corresponding detector arrays (4.1–4.5) are measured and evaluated, using the following steps according to the invention:
1. generating an at least two-dimensional picture of the object (1) from the measured intensity values;
2. selecting one of the spatial regions displayed in the picture as a basis of the value of a material value, which is determined from intensity measurements, for examination;
3. determining at least one spatial-geometric value in the region to the examined from positional data of a two-dimensional picture and from intensity values using a stored value of a specific, absorption-influenced value of a suspected material.
4. determining, in addition, the corresponding spatial-geometric value solely from three-dimensional geometric values, which are determined from measured intensity values; and
5. comparing, directly or indirectly, values of the spatial-geometric values determined in steps 3 and 4, or values derived therefrom, in order to determine if the suspected material is actually present.
109 Citations
13 Claims
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1. A method for detecting a specific material in an object using electromagnetic beams, whereby intensities of non-absorbed beams from at least three beam planes in corresponding detector arrays are measured and evaluated, said method comprising the steps of:
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a) generating at least a two-dimensional picture of the object from the measured intensity values; b) selecting one of the spatial regions displayed in the picture on a basis of the value of a material value, which is determined from intensity measurements, for examination; c) determining a first spatial-geometric value in the region to be examined from positional data of a two-dimensional picture and from intensity values using a stored value of a material-specific, absorption-influenced value of a suspected material; d) determining a second spatial-geometric value solely from three-dimensional geometric values, which are determined from measured intensity values; and e) comparing, directly or indirectly, the first spatial-geometric value with the second spatial-geometric value in order to determine if the suspected material is actually present. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A device comprising:
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a transport device for moving an object through a radiation tunnel; radiation sources, which are positioned around the transport device, said radiation sources emitting beams in at least three beam planes, each being aligned with a corresponding detector, wherein at least two of the beam planes are not parallel with one another; and an evaluator for detecting a specific material in the object by; a) generating at least a two-dimensional picture of the object from the measured intensity values; b) selecting one of the spatial regions displayed in the picture on a basis of the value of a material value, which is determined from intensity measurements, for examination; c) determining a first spatial-geometric value in the region to be examined from positional data of a two-dimensional picture and from intensity values using a stored value of a material-specific, absorption-influenced value of a suspected material; d) determining a second spatial-geometric value solely from three-dimensional geometric values, which are determined from measured intensity values; and e) comparing, directly or indirectly, the first spatial-geometric value with the second spatial-geometric value in order to determine if the suspected material is actually present.
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Specification