Inspection system and method
First Claim
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1. A system for nuclear material detection, comprising:
- a shielding layer adapted to allow muons, passing through the shielding layer while cutting off all other charged particles, at least a first flat muon detector and a second flat muon detector positioned along the way of muons passed through the shielding layer,the first muon detector is indicative of a first muon coordinate and a first incidence angle, and the second muon detector is indicative of an actual second muon coordinate and an actual second incidence angle,a digital signal processing unit for calculating a predicted second coordinate and a predicted second incidence angle,an alarm system being adapted for generating an alarm when a presence of a nuclear material between the first and the second flat muon detectors suspected, wherein the digital signal processing unit compares the actual second muon coordinate and the actual second incidence angle with the predicted second coordinate and the predicted second incidence angle for each muon, and the presence of nuclear material between the first and the second muon detectors is suspected if a difference between the actual second incidence angle and the predicted second incidence angle is larger than a predetermined value;
further comprising;
a chemical detection system, whereinthe chemical detection system is a photo-thermal, interferometric spectroscopy system, including a first light source assembly that emits a first beam, the first beam having one or more wavelengths that interact with the chemical and change a refractive index of the chemical;
a second laser that produces a second beam, the second beam interacting with the chemical resulting in a third beam with a phase change that corresponds with the change of the refractive index of the chemical; and
a detector system positioned remote from the chemical to receive at least a portion of the third beam, the detector system providing information on a phase change in the third beam relative to the second beam that is indicative of at least one of, absorption spectrum and concentration of the chemical.
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Abstract
A method and system for nuclear substance revealing using muon detection technique is presented. In some aspects, naturally occurred muons are selected from the flow of charged particles. Muon coordinate and incidence angle measured above and below the interrogated volume can be used for the decision making on the presence of nuclear substance inside the volume. The system is adapted for performing measurements on moving objects such as moving trucks. A combination of the nuclear substance detection system with an explosive sensing system is presented.
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Citations
20 Claims
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1. A system for nuclear material detection, comprising:
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a shielding layer adapted to allow muons, passing through the shielding layer while cutting off all other charged particles, at least a first flat muon detector and a second flat muon detector positioned along the way of muons passed through the shielding layer, the first muon detector is indicative of a first muon coordinate and a first incidence angle, and the second muon detector is indicative of an actual second muon coordinate and an actual second incidence angle, a digital signal processing unit for calculating a predicted second coordinate and a predicted second incidence angle, an alarm system being adapted for generating an alarm when a presence of a nuclear material between the first and the second flat muon detectors suspected, wherein the digital signal processing unit compares the actual second muon coordinate and the actual second incidence angle with the predicted second coordinate and the predicted second incidence angle for each muon, and the presence of nuclear material between the first and the second muon detectors is suspected if a difference between the actual second incidence angle and the predicted second incidence angle is larger than a predetermined value;
further comprising;a chemical detection system, wherein the chemical detection system is a photo-thermal, interferometric spectroscopy system, including a first light source assembly that emits a first beam, the first beam having one or more wavelengths that interact with the chemical and change a refractive index of the chemical; a second laser that produces a second beam, the second beam interacting with the chemical resulting in a third beam with a phase change that corresponds with the change of the refractive index of the chemical; and a detector system positioned remote from the chemical to receive at least a portion of the third beam, the detector system providing information on a phase change in the third beam relative to the second beam that is indicative of at least one of, absorption spectrum and concentration of the chemical. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for nuclear material revealing, comprising the steps of:
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selecting muons from other charged particles, continuously measuring a first coordinate and a first incident angle of incoming muons by a first detector, estimating a predicted second coordinate and a predicted second incidence angle at a second detector for each incoming muon, continuously measuring an actual second coordinate and an actual second incidence angle for each incoming muon by the second detector, comparing the actual second coordinate and the actual second incidence angle with the predicted second coordinate and the predicted second incidence angle for each muon, producing an alarm signal if a difference between the predicted second incidence and the actual second incidence angle exceeds a predetermined value, further comprising chemical substance detecting, including; emitting a first light beam having one or more wavelengths, the beam interacting with the chemical and changing a refractive index of the chemical; emitting a second beam, the second beam interacting with the chemical resulting in a third beam with a phase change that corresponds with the change of the refractive index of the chemical; detecting at least a portion of the third beam, recovering information on a phase change in the third beam relative to the second beam that is indicative of at least one of, absorption spectrum and concentration of the chemical. - View Dependent Claims (19, 20)
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Specification