Self contained mobile inspection system and method

• US 8,385,501 B2
• Filed: 07/01/2011
• Issued: 02/26/2013
• Est. Priority Date: 07/23/2002
• Status: Expired due to Fees

• Current Assignee: Rapiscan Systems Incorporated (OSI Systems Incorporated)
• Original Assignee: Rapiscan Systems Incorporated (OSI Systems Incorporated)
• Inventors: Allman, Bryan, Kotowski, Andreas F.
• Primary Examiner(s): Kiknadze, Irakli
• Application Number:
  US13/175,792
• Publication Number:
  US 20120027172A1
• Time in Patent Office: 606 Days
• Field of Search: 378/57, 378/62, 378/64, 378/198
• US Class Current: 378/57
• CPC Class Codes: G01V 5/20 Detecting prohibited goods, e.g. weapons, explosives, hazardous substances, contraband or smuggled objects
• CPC Class Codes: G01V 5/222 measuring scattered radiation
• CPC Class Codes: G01V 5/232 having relative motion between the source, detector and object other than by conveyor G01V5/226 takes precedence

Abstract

The inspection methods and systems of the present invention are mobile, rapidly deployable, and capable of scanning a wide variety of receptacles cost-effectively and accurately on uneven surfaces. The present invention is directed toward a portable inspection system for generating an image representation of target objects using a radiation source, comprising a mobile vehicle, a detector array physically attached to a movable boom having a proximal end and a distal end. The proximal end is physically attached to the vehicle. The invention also comprises at least one source of radiation. The radiation source is fixedly attached to the distal end of the boom, wherein the image is generated by introducing the target objects in between the radiation source and the detector array, exposing the objects to radiation, and detecting radiation.

Claims

1. A system for inspecting a vehicle, having contraband, and generating an image representation of said contraband, comprising:

a radiation source;

a movable boom comprising at least a first and second portion, wherein the movable boom is adapted to be moved from a first position to a second position;

a detector array comprising a plurality of detectors and attached to one of the portions of the movable boom, wherein, upon moving said boom to the second position, an inspection region is formed by the radiation source and the detector array; and

a processing system, wherein said processing system is configured to

Calibrate the plurality of detectors by deriving a baseline radiation measurement, wherein said baseline radiation measurement is taken before said vehicle enters the inspection region;

Irradiate said vehicle within said inspection region;

Obtain measurements of transmitted radiation from said plurality of detectors;

Generate an image from said measurements; and

Display said image simultaneously with a reference image, wherein said reference image comprises a representation of a vehicle without contraband.

2. The system of claim 1 wherein said image has a resolution of grid points spaced approximately every 5 cm long the length and approximately 4.3 cm along a height of the vehicle.

3. The system of claim 1 wherein said image has a resolution adequate to achieve a detectability limit of less than 0.5 kilogram of contraband.

4. The system of claim 1 wherein three baseline radiation measurements are obtained for each detector in said detector array.

5. The system of claim 1 wherein each of said baseline radiation measurements are stored in an array in a memory.

6. The system of claim 1 wherein the first portion is vertical and physically attached to a platform, wherein the detector array is physically attached to the second portion of said movable boom, and wherein the radiation source is located on said platform.

7. The system of claim 1 wherein the first portion is vertical and physically attached to a platform and wherein the detector array is physically attached to the first portion of said movable boom.

8. The system of claim 1 wherein the measurements of transmitted radiation from said plurality of detectors are indicative of photo current levels.

9. The system of claim 1 wherein the measurements of transmitted radiation from said plurality of detectors are obtained by querying each detector for a photo current level measurement.

10. The system of claim 1 wherein the processing system obtains photo current level measurements, stores said current level measurements in an array, and converts said stored photo current level measurements into pixel values.

11. The system of claim 10 wherein the stored photo current level measurements are converted into pixel values by mapping an amount of photo current level to a color.

12. The system of claim 1 wherein the processing system determines a vertical display position of each pixel value and wherein said vertical display position is determined based upon a number of the detector that generated a photo current level measurement which was converted to said pixel value.

13. The system of claim 1 wherein the processing system determines a horizontal display position of each pixel value and wherein said horizontal display position is determined based upon an horizontal position associated with a photo current level measurement which was converted to said pixel value.

14. A system for inspecting a vehicle, having contraband, and generating an image representation of said contraband, comprising:

a radiation source;

a movable boom comprising at least a first and second portion, wherein the movable boom is adapted to be moved from a first position to a second position;

a detector array comprising a plurality of detectors and attached to one of the portions of the movable boom, wherein, upon moving said boom to the second position, an inspection region is formed by the radiation source and the detector array; and

a processing system, wherein said processing system is configured to

Calibrate the plurality of detectors by deriving a baseline radiation measurement, wherein said baseline radiation measurement is taken before said vehicle enters the inspection region;

Irradiate said vehicle within said inspection region;

Obtain measurements of transmitted radiation from said plurality of detectors;

Generate an image from said measurements, said image comprising a plurality of pixels defining an image resolution; and

Display said image, wherein said image resolution is sufficient to detect less than 0.5 kilograms of contraband per pixel.

15. The system of claim 14 wherein the processing system obtains three baseline radiation measurements for each detector in said detector array.

16. The system of claim 14 wherein the first portion is vertical and physically attached to a platform, wherein the detector array is physically attached to the second portion of said movable boom.

17. The system of claim 16 wherein the radiation source is located on said platform.

18. The system of claim 14 wherein the first portion is vertical and physically attached to a platform and wherein the detector array is physically attached to the first portion of said movable boom.

19. The system of claim 14 wherein the measurements of transmitted radiation from said plurality of detectors are indicative of photo current levels.

20. The system of claim 14 wherein the measurements of transmitted radiation from said plurality of detectors are obtained by querying each detector for a photo current level measurement.