System and method for large scale detection of hazardous materials in the mail or in other objects

• US 7,105,135 B2
• Filed: 10/15/2002
• Issued: 09/12/2006
• Est. Priority Date: 10/16/2001
• Status: Expired due to Fees

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Ii, David L., Beckert, John Thaddeus, Terry, William S.
• Primary Examiner(s): Le, Long V.
• Assistant Examiner(s): CHEU, CHANGHWA J
• Application Number:
  US10/270,987
• Publication Number:
  US 20030082635A1
• Time in Patent Office: 1,428 Days
• Field of Search: 435/7.1, 435/7.92, 436/542, 436/43, 382/100, 382/101, 382/102, 422/62, 422/82.07, 422/63, 422/119
• US Class Current: 422/119
• CPC Class Codes: G01N 1/22 in the gaseous state specially adapted for biological material G01N33/497; measuring breath flow A61B5/087
• CPC Class Codes: G01N 2001/022 sampling for security purposes, e.g. contraband, warfare agents
• CPC Class Codes: G01N 2001/025 postal items
• CPC Class Codes: G01N 21/31 Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry G01N21/72 takes precedence
• CPC Class Codes: G01N 31/22 using chemical indicators G01N31/02 takes precedence
• CPC Class Codes: Y10T 436/11 Automated chemical analysis

Abstract

A system and method that enables early detection of hazardous materials, such as explosives and biological materials, in the early phases of mail handling or processing, is disclosed. The early detection of such hazardous material utilizing the system and method of this invention can be performed while the mail is being processed. The system includes at least two primary elements: an activation sub-system and a sense and analyze sub-system.

Claims

1. A system for detecting of hazardous materials on a mail piece, said system comprising:

means for transporting the mail piece;

means for sensing location and size of the mail piece;

means for depositing at least one sensitizing agent on a desired loci of locations on a the surface of the mail piece while the mail piece is being transported;

means for sensing, while the mail piece is being transported, said at least one sensitizing agent after being deposited on the surface of the mail piece to determine whether hazardous material is located on the surface of the mail piece;

means for adjusting travel time of said mail piece within a predetermined travel time, said predetermined travel time being equal to or greater than an activation latency time for said deposited sensitizing agent on the mail piece prior to reaching said sensing means for said sensitizing agent; and

means for analyzing results of said sensing;

wherein a change in a property of said sensitizing agent is indicative of the presence of hazardous materials.

2. The system of claim 1 further comprising:

means for calling and setting die mail piece aside for further inspection, if analysis indicates that the mail piece potentially contains hazardous materials.

3. The system of claim 1 wherein said at least one sensitizing agent is a polymer having an alterable luminescence and wherein exposure to a target biological material results in a detectable change in luminescence;

whereby said target biological material is a biological hazardous material.

4. The system of claim 3 wherein said sensing means comprise a radiation source capable of emitting at a first spectrum and a detector capable of detecting emitted radiation at a second spectrum.

5. The system of claim 1 wherein said at least one sensitizing agent is a reagent and wherein said reagent exhibits a change an color when exposed to a target explosive material.

6. The system of claim 5 wherein said sensing means comprise

a detector capable of detecting colorimetric change.

7. The system of claim 1 wherein said means for sensing comprise:

at least one radiation source capable of emitting radiation and of illuminating said at least one sensitizing agent an the surface of the mail piece; and

at least one detector capable of detecting radiation emitted from said at least one sensitizing agent.

8. The system of claim 7 wherein means for sensing further comprise:

means for controlling emission of radiation from said at least one radiation source.

9. The system of claim 2 wherein said means for culling and setting the mail piece aside comprise:

an actuator; and

an actuator control module.