X-ray backscatter mobile inspection van

• US 7,099,434 B2
• Filed: 05/21/2003
• Issued: 08/29/2006
• Est. Priority Date: 11/06/2002
• Status: Expired due to Term

• Current Assignee: American Science and Engineering Incorporated (OSI Systems Incorporated)
• Original Assignee: American Science and Engineering Incorporated (OSI Systems Incorporated)
• Inventors: Adams, William, Grodzins, Lee, Rothschild, Peter, Chalmers, Alex, Perich, Louis W.
• Primary Examiner(s): Glick, Edward J.
• Assistant Examiner(s): KAO, CHIH CHENG G
• Application Number:
  US10/442,687
• Publication Number:
  US 20040086078A1
• Time in Patent Office: 1,196 Days
• Field of Search: 378/2, 378/57, 378/86, 378/87, 378/88, 378/160, 250/358.1, 250/359.1, 250/360.1
• US Class Current: 378/57
• CPC Class Codes: G01T 3/06 with scintillation detectors
• 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
• CPC Class Codes: G01V 5/26 Passive interrogation, i.e. by measuring radiation emitted by objects or goods

Abstract

An inspection system based upon an enclosed conveyance such as a van, capable of road travel, for inspecting objects of inspection that may include persons. The conveyance is characterized by an enclosing body, or skin. A source of penetrating radiation and a spatial modulator for forming the penetrating radiation into a beam, both contained entirely within the body of the enclosed conveyance, irradiate an object with a time-variable scanning profile. A detector module generates a scatter signal based on penetrating radiation scattered by contents of the object, while a proximity sensor generates a relative motion signal based on a relative disposition of the conveyance and the inspected object. An image is formed of the contents of the object based in part on the scatter signal and the relative motion signal. A detector, which may be separate or part of the scatter detector module, may exhibit sensitivity to decay products of radioactive material.

Claims

1. An inspection system for inspecting an object of inspection, the system comprising:

a. a fully enclosed conveyance characterized by an enclosing body;

b. a source of penetrating radiation contained entirely within the body of the enclosed conveyance for generating penetrating radiation;

c. a spatial modulator for forming the penetrating radiation into a beam for irradiating the object with a time-variable scanning profile, the object disposed entirely outside the enclosing body;

d. a detector module contained, during the course of operation, entirely within the body of the fully enclosed conveyance, for generating a scatter signal based on penetrating radiation scattered by contents of the object;

e. a proximity sensor for generating a relative motion signal based on a relative disposition of the enclosed conveyance and the inspected object; and

f. a controller for ascertaining a specified characteristic of the contents of the object.

2. An inspection system in accordance with claim 1, wherein the conveyance is a vehicle capable of road travel.

3. An inspection system in accordance with claim 1, further comprising an image generator for forming a signal into an image of the contents of the object based in part on the scatter signal and the relative motion signal.

4. An inspection system in accordance with claim 1, wherein the source of penetrating radiation is an x-ray tube.

5. An inspection system in accordance with claim 1, wherein the source of penetrating radiation is an x-ray tube emitting radiation at energies below approximately 250 keV.

6. An inspection system in accordance with claim 1, wherein the source of penetrating radiation includes a rotating chopper wheel.

7. An inspection system in accordance with claim 1, wherein the source of penetrating radiation emits radiation to one side of the enclosed conveyance.

8. An inspection system in accordance with claim 1, wherein the source of penetrating radiation emits radiation to two sides of the enclosed conveyance.

9. An inspection system in accordance with claim 1, further comprising a detector for detecting radiation emitted by contents of the body.

10. An inspection system in accordance with claim 9, wherein the detector for detecting radiation emitted by contents of the body is sensitive to neutrons.

11. An inspection system in accordance with claim 9, wherein the detector for detecting radiation emitted by contents of the body is sensitive to gamma rays.

12. An inspection system in accordance with claim 1, wherein the proximity sensor is chosen from the group of sensors including radar, ultrasound, optical, laser, and LIDAR sensors.

13. A method for inspecting an object of inspection with penetrating radiation, the method comprising:

a. generating a beam of penetrating radiation originating entirely within a body of a fully enclosed conveyance;

b. scanning the penetrating radiation across the object disposed entirely outside the body with a time-variable scanning profile;

c. detecting penetrating radiation scattered by the object into the body of the fully enclosed conveyance and generating a scatter signal;

d. generating a relative motion signal based on a relative disposition of the enclosed conveyance and the inspected object; and

e. ascertaining a specified characteristic of contents of the object based in part on the scatter signal and the relative motion signal.

14. A method in accordance with claim 13, further comprising:

forming an image of the contents of the object based in part on the scatter signal

and the relative motion signal.

15. A method in accordance with claim 13, further comprising:

directing the penetrating radiation based at least in part on the relative motion signal.