Density detection using discrete photon counting
First Claim
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1. A system using discrete photon counting to generate a graphical display indicative of densities in a target object comprising:
- a radiation source having a variable, controlled position relative to the target object to radiate photons toward the target object wherein the target object is selected from the group consisting of a vehicle, a cargo container, and a railroad car;
a linear array of photon detectors having a variable, controlled position relative to the target object to receive photons passing through the target object;
a motion controller coupled to the radiation source and the linear array of photon detectors for determining and controlling motion of one or more of the detector array and the radiation source, such that a constant distance is maintained therebetween;
a counter comprising an amplifier, a discriminator, and a pulse generator for each photon detector and means for discretely counting photons received by each photon detector; and
a display responsive to the counter for generating a graphical display of densities in the target object in response to the counter.
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Abstract
A system and method of density detection in a target object involve irradiating the target object, detecting a first and second discrete number of photons penetrating the target object through respective first and second prescribed volumes and entering respective first and second radiation detectors. First and second numbers of photons detected by the first and second radiation detectors are counted, and a display output signal is generated in response to the first and second numbers. A graphical representation of the densities within the first and second volumes of the target object is displayed.
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Citations
1 Claim
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1. A system using discrete photon counting to generate a graphical display indicative of densities in a target object comprising:
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a radiation source having a variable, controlled position relative to the target object to radiate photons toward the target object wherein the target object is selected from the group consisting of a vehicle, a cargo container, and a railroad car;
a linear array of photon detectors having a variable, controlled position relative to the target object to receive photons passing through the target object;
a motion controller coupled to the radiation source and the linear array of photon detectors for determining and controlling motion of one or more of the detector array and the radiation source, such that a constant distance is maintained therebetween;
a counter comprising an amplifier, a discriminator, and a pulse generator for each photon detector and means for discretely counting photons received by each photon detector; and
a display responsive to the counter for generating a graphical display of densities in the target object in response to the counter.
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Specification
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Current AssigneeLeidos, Inc. (Leidos Holdings, Inc.)
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Original AssigneeScience Applications International Corporation
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InventorsSmith, Scott T., Verbinski, Victor V., Valentine, Kenneth H., Orphan, Victor J.
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Primary Examiner(s)Hannaher, Constantine
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Assistant Examiner(s)GAGLIARDI, ALBERT J
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Application NumberUS09/398,980Time in Patent Office655 DaysField of Search250/358.1, 250/359.1, 250/360.1, 378/197, 378/198, 378/51, 378/54, 378/55, 378/57US Class Current250/358.1CPC Class CodesG01N 23/02 by transmitting the radiati...G01V 5/22 Active interrogation, i.e. ...
