System for inspecting the contents of a container

• US 6,542,574 B2
• Filed: 03/20/2002
• Issued: 04/01/2003
• Est. Priority Date: 12/01/1998
• 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: Grodzins, Lee
• Primary Examiner(s): Church, Craig E.
• Application Number:
  US10/101,671
• Publication Number:
  US 20020097836A1
• Time in Patent Office: 377 Days
• Field of Search: 378/57, 378/86-90, 378/137
• US Class Current: 378/57
• CPC Class Codes: G01N 23/20 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
• 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: G21K 1/025 using multiple collimators, e.g. Bucky screens; other devices for eliminating undesired or dispersed radiation
• CPC Class Codes: H01J 35/153 Spot position control
• CPC Class Codes: H01J 35/30 by deflection of the cathode ray

Abstract

A system for inspecting the contents of a container is provided. The system includes a first source for emitting sequential beams of penetrating electromagnetic radiation from a target in a first set of substantially parallel directions, a conveyor for moving the container relative to the first source, a first detector for detecting the penetrating radiation after interaction with the contents of the container and generating a first set of signals corresponding to each of the substantially parallel directions and a controller for characterizing the contents of the container based at least on the first set of signals. The first detector may be a scatter detector. Similarly, the first detector may be a transmission detector.

Claims

1. A system for inspecting the contents of a container, the system comprising:

a first apparatus for emitting sequential beams of penetrating electromagnetic radiation from a target in a first set of substantially parallel directions;

the first apparatus including;

a source for producing a beam of charged particles,

a target having a surface which receives the beam of charged particles and emits electromagnetic waves in response thereto,

an electromagnetic beam director that directs the beam of charged particles to a plurality of specified locations on the target,

an electromagnetic steering device disposed proximal to the target, the electromagnetic steering device directing the charged particles to strike the target at a substantially ninety degree angle to the surface of the target, and

a collimator, the collimator having an array of transmitting regions and being disposed proximal to the target such that electromagnetic wave emitted from the target pass through the collimator and emerge from the array of transmitting regions in a series of parallel beams;

a conveyor for moving the container relative to the first source;

a first detector for detecting the penetrating radiation after interaction with the contents of the container and generating a first set of signals corresponding to each of the substantially parallel directions; and

a controller for characterizing the contents of the container based at least on the first set of signals.

2. A system according to claim 1, wherein the first detector is a scatter detector.

3. A system according to claim 1, wherein the first detector is a transmission detector.

4. A system according to claim 1, further comprising:

a second apparatus for emitting penetrating electromagnetic radiation directed in a direction substantially opposite to the first set of substantially parallel directions.

5. A system according to claim 4, further comprising:

a second detector for detecting radiation after interaction with the contents of the container and generating a second signal corresponding to the substantially opposite direction.

6. A system according to claim 5, wherein the second detector is a scatter detector.

7. A system according to claim 5, wherein the second detector is a transmission detector.

8. A system according to claim 4, wherein the second apparatus for emitting penetrating electromagnetic radiation comprises:

a source for producing a beam of charged particles;

a target having a surface which receives the beam of charged particles and emits electromagnetic waves in response thereto;

an electromagnetic beam director that directs the beam of charged particles to a plurality of specified locations on the target;

an electromagnetic steering device disposed proximal to the target, the electromagnetic steering device directing the charged particles to strike the target at a substantially ninety degree angle to the surface of the target; and

a collimator, the collimator having an array of transmitting regions and being disposed proximal to the target such that electromagnetic wave emitted from the target pass through the collimator and emerge from the array of transmitting regions in a series of parallel beams.

9. A system according to claim 8, further comprising:

a second detector for detecting radiation after interaction with the contents of the container and generating a second signal corresponding to the substantially opposite direction.

10. A system according to claim 9, wherein the second detector is a scatter detector.

11. A system according to claim 9, wherein the second detector is a transmission detector.