Density detection using real time discrete photon counting for fast moving targets

  • US 6,507,025 B1
  • Filed: 09/17/1999
  • Issued: 01/14/2003
  • Est. Priority Date: 10/23/1995
  • Status: Expired due to Term
First Claim
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1. A system for detecting and graphically displaying a contents of a fast-moving target object comprising:

  • a radiation source, having a position such that at least a portion of radiation emitted from the radiation source passes through the fast-moving target object, the fast-moving target object having a variable velocity and acceleration while maintaining a substantially constant distance from the radiation source and being selected from the group consisting of;

    a vehicle, a cargo container, and a railroad car;

    a velocity measuring device configured to measure the variable velocity of the fast-moving target object;

    a detector array comprising a plurality of photon detectors, having a position such that at least some of the at least a portion of the radiation passing through the target object is received thereby, the detector array having a variable count time according to the variable velocity and a grid unit size;

    a counter circuit coupled to the detector array for discretely counting a number of photons entering individual photon detectors of the detector array, the counter circuit measuring a count rate according to a contents within the fast-moving target object;

    a high baud rate interface coupled to the counter circuit for sending count information from the counter circuit at a rate fast enough to support real-time data transfer therethrough; and

    a processor coupled to the velocity measuring device and to the high baud-rate interface, receiving count information from the high baud-rate interface and generating distortion-free image data in real time as a function of the count information and the variable velocity.

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