Multiple pass cargo inspection system

• US 8,457,275 B2
• Filed: 03/28/2012
• Issued: 06/04/2013
• Est. Priority Date: 05/05/2006
• Status: Active Grant

• Current Assignee: Rapiscan Systems Incorporated (OSI Systems Incorporated)
• Original Assignee: Rapiscan Systems Incorporated (OSI Systems Incorporated)
• Inventors: Akery, Alan
• Primary Examiner(s): THOMAS, COURTNEY D
• Application Number:
  US13/433,270
• Publication Number:
  US 20120273684A1
• Time in Patent Office: 433 Days
• Field of Search: 378/57
• US Class Current: 378/57
• CPC Class Codes: G01N 23/044 using laminography or tomosynthesis
• CPC Class Codes: G01T 1/24 with semiconductor detectors
• CPC Class Codes: G01V 5/22 Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays
• CPC Class Codes: G01V 5/232 having relative motion between the source, detector and object other than by conveyor G01V5/226 takes precedence
• CPC Class Codes: H05H 9/00 Linear accelerators

Abstract

The present invention is a cargo inspection system, employing a radiation source, capable of scanning vehicles and/or cargo in a wide range of sizes, including conventional imaging areas as well as taller and bulkier enclosures at sufficiently optimal efficacy and overall throughput. In one embodiment, the present invention is a multiple pass inspection method for inspecting vehicles and their cargo, comprising a first pass scan, wherein said first pass scan includes moving a radiation source at a suitable scanning distance, rotating a radiation source at a suitable scanning angle, and moving said radiation source along an object under inspection.

Claims

1. A method of inspecting an object within an inspection zone wherein said inspection zone is defined by a radiation source on a first side of said inspection zone and a detector array on an opposing side of said inspection zone, comprising:

Receiving the object, having a volume, in said inspection zone at a first position;

Positioning said radiation source to irradiate said object in a first scan;

Re-positioning said radiation source if said first scan does not irradiate the entire volume of the object in the first scan; and

Conducting a second scan with said re-positioned radiation source.

2. The method of claim 1, wherein said radiation source is an X-ray source.

3. The method of claim 1, wherein said radiation source is a gamma source.

4. The method of claim 1, wherein said radiation source is a linear accelerator.

5. The method of claim 1, wherein, when the radiation source is repositioned, the detector array is rotated about an axis.

6. The method of claim 5, wherein said rotation of the detector array aligns the detector array with the radiation source during operation of the radiation source.

7. The method of claim 1, wherein the radiation source is adapted to conduct the first scan of the object at a first vertical position and at a first scanning angle, and, after completion of said first scan, conduct the second scan at a second vertical position and at a second scanning angle.

8. The method of claim 7, wherein to move from the first scanning angle to the second scanning angle, the radiation source rotates in a range of 0 to 90 degrees.

9. The method of claim 7, wherein the first scanning angle is different from said second scanning angle.

10. The method of claim 1, wherein the first scan forms a first scanning region, wherein the second scan forms a second scanning region, and wherein the first scanning region is different from the second scanning region.

11. The method of claim 1, wherein the first scan produces an image of the object, wherein said image includes a width of the object of up to 3 meters and a height of the object of up to 2 meters.

12. The method of claim 1, wherein the radiation source is repositioned if the object is taller than 2 meters.

13. The method of claim 1, wherein the detector array is adapted to rotate about an axis and wherein said rotation of the detector array aligns the detector array with the radiation source during the first scan and during the second scan.

14. A method of inspecting an object, comprising:

Receiving the object, having a volume, in an inspection zone at a first position, wherein said inspection zone is defined by a radiation source, in a first position, on a first side of said inspection zone and a detector array on an opposing side of said inspection zone;

Activating said radiation source to irradiate said object in a first scan;

Re-positioning said radiation source if said first scan does not irradiate the entire volume of the object in the first scan; and

Conducting a second scan with said re-positioned radiation source.

15. The method of claim 14, wherein said radiation source is at least one of an X-ray source, a gamma source, or a linear accelerator.

16. The method of claim 14, wherein, when the radiation source is repositioned, the detector array is rotated about an axis.

17. The method of claim 16, wherein said rotation of the detector array aligns the detector array with the radiation source during operation of the radiation source.

18. The method of claim 14, wherein the radiation source is adapted to conduct the first scan of the object at a first vertical position and at a first scanning angle, and, after completion of said first scan, conduct the second scan at a second vertical position and at a second scanning angle.

19. The method of claim 18, wherein to move from the first scanning angle to the second scanning angle, the radiation source rotates in a range of 0 to 90 degrees.

20. The method of claim 14, wherein the first scan produces an image of the object, wherein said image includes a width of the object of up to 3 meters and a height of the object of up to 2 meters.

21. The method of claim 14, wherein the radiation source is repositioned if the object is taller than 2 meters.