Networked miniature chemical optical sensors

• US 6,700,484 B2
• Filed: 12/07/2000
• Issued: 03/02/2004
• Est. Priority Date: 12/30/1999
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Arbuthnot, Diane L., Bartholomew, Dwight Urban
• Primary Examiner(s): POPE, DARYL C
• Application Number:
  US09/732,335
• Publication Number:
  US 20020070854A1
• Time in Patent Office: 1,181 Days
• Field of Search: 340/531, 340/600, 340/632, 340/633, 250/369, 324/329, 324/326, 735/79, 735/87
• US Class Current: 340/531
• CPC Class Codes: F41H 11/12 Means for clearing land minefields; Systems specially adapted for detection of landmines
• CPC Class Codes: F41H 11/134 Chemical systems, e.g. with detection by vapour analysis
• CPC Class Codes: G01N 21/7703 using reagent-clad optical fibres or optical waveguides using measurement of total internal reflection or attenuated total reflection G01N21/552; optical fibres or waveguides per se G02B

Abstract

A network for detecting a substance includes at least two detectors that are capable of transmitting a signal, and a remote station capable of receiving the signal. The detectors are adapted to detect a substance and transmit data that indicates the presence of that substance to the remote receiving station.

Claims

1. A vapor detecting system, comprising:

a light transparent waveguide infused with a material which reacts with a vapor to be detected to alter the light transparency of the waveguide;

a light source for passing light through the waveguide; and

a detector for detecting and evaluating changes in the light passing through the waveguide to determine the existence of the vapor to be detected.

2. The system of claim 1 wherein the waveguide is PVC, the infused material is Jeffamine T-403 and the vapor is a polynitroaromatic compound.

3. The system of claim 2 wherein the polynitroaromatic compound is TNT.

4. The system of claim 1 further including means disposed between said light source and said waveguide to focus said light onto said waveguide and a light block to block impingement of stray light onto said waveguide.

5. The system of claim 4 further including a reflective region disposed along a length of said waveguide to enhance the intensity of said light within said waveguide.

11. The system of claim 1 further including a housing containing said light transparent waveguide infused with a material which reacts with a vapor to be detected to alter the light transparency of the waveguide, said light source for passing light through the waveguide and said detector for detecting and evaluating changes in the light passing through the waveguide to determine the existence of the vapor to be detected and a fan within said housing for increasing air flow across said waveguide.

6. A vapor detecting system, comprising:

a plurality of light transparent waveguides, each infused with a different material which reacts with a different vapor to be detected to alter the light transparency of the waveguides;

means for passing light through the waveguides; and

a separate detector for each waveguide for detecting and evaluating changes in the light passing through each waveguide to determine the existence of the vapors to be detected.

7. The system of claim 6 wherein said means for passing light through the waveguides comprises a separate light source for each of said waveguides, each said light source having a different light frequency.

8. The system of claim 7 wherein the material infused in each of said waveguides is reactive to the light frequency passing through the waveguide when the vapor to be detected is reacted with the infused material.

9. A radiation detecting system, comprising:

a light transparent waveguide infused with a material which emits light when exposed to radiation to be detected; and

a detector for detecting and evaluating changes in the light passing through the waveguide to determine the existence of the radiation to be detected.

10. The system of claim 9 wherein the infused material is a scintillation chemical.

12. A system for vapor detection which comprises:

a plurality of spaced apart detector systems, each detector system comprising a housing, each housing containing a light transparent waveguide infused with a material which reacts with a vapor to be detected to alter the light transparency of the waveguide, a light source for passing light through the waveguide and a detector for detecting and evaluating changes in the light passing through the waveguide to determine the existence of the vapor to be detected;

each housing containing means for transmitting information from the detector to a remote location.

13. The system of claim 12 further including a wire interconnecting said detector systems.

14. The system of claim 12 wherein each of said detector system includes means to transmit an address to indicate the detector system from which the transmitted information emanates.

15. A vapor detecting method, comprising the steps of:

providing a light transparent waveguide infused with a material which reacts with a vapor to be detected to alter the light transparency of the waveguide;

passing a light through the waveguide; and

detecting and evaluating changes in the light passing through the waveguide to determine the existence of the vapor to be detected.

16. The method of claim 15, further including focussing said light onto said waveguide and blocking impingement of stray light onto said waveguide.

17. The method of claim 16 further including providing a reflective region disposed along a length of said waveguide to enhance the intensity of said light within said waveguide.

18. A vapor detecting method, comprising the steps of:

providing a plurality of light transparent waveguides, each infused with a different material which reacts with a different vapor to be detected to alter the light transparency of the waveguides;

passing light through the waveguides; and

detecting and evaluating changes in the light passing through each waveguide to determine the existence of the vapors to be detected.

19. The method of claim 18 wherein said means for passing light through the waveguides comprises a separate light source for each of said waveguides, each said light source having a different light frequency.

20. The method of claim 19 wherein the material infused in each of said waveguides is reactive to the light frequency passing through the waveguide when the vapor to be detected is reacted with the infused material.