Methods and apparatus for molecular species detection, inspection and classification using ultraviolet to near infrared Enhanced Photoemission Spectroscopy

• US 20080191137A1
• Filed: 06/29/2007
• Published: 08/14/2008
• Est. Priority Date: 06/29/2006
• Status: Abandoned Application

• Current Assignee: CDEX Incorporated
• Original Assignee: CDEX Incorporated
• Inventors: Philips, Malcolm Howard, Poteet, Wade Martin, Ryles, James
• Application Number:
  US11/822,020
• Publication Number:
  US 20080191137A1
• Time in Patent Office: Days
• US Class Current: 250/338.1
• CPC Class Codes: G01J 3/02 Details
• CPC Class Codes: G01J 3/0256 Compact construction
• CPC Class Codes: G01J 3/0264 Electrical interface; User interface
• CPC Class Codes: G01J 3/027 Control of working procedures of a spectrometer; Failure detection; Bandwidth calculation
• CPC Class Codes: G01J 3/0272 Handheld
• CPC Class Codes: G01J 3/0278 Control or determination of height or angle information for sensors or receivers
• CPC Class Codes: G01J 3/0289 Field-of-view determination; Aiming or pointing of a spectrometer; Adjusting alignment; Encoding angular position; Size of measurement area; Position tracking
• CPC Class Codes: G01J 3/42 Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry beam switching arrangements G01J3/08
• CPC Class Codes: G01J 3/443 Emission spectrometry
• CPC Class Codes: G01N 2021/6417 Spectrofluorimetric devices
• CPC Class Codes: G01N 21/645 Specially adapted constructive features of fluorimeters
• CPC Class Codes: G01N 2201/0221 Portable; cableless; compact; hand-held

Abstract

The invention relates generally to the field of substance and material detection, inspection, and classification at wavelengths between approximately 200 nm and approximately 1800 nm. In particular, a handheld Enhanced Photoemission Spectroscopy (“EPS”) detection system with a high degree of specificity and accuracy, capable of use at small and substantial standoff distances (e.g., greater than 12 inches) is utilized to identify specific substances (e.g., controlled substances, illegal drugs and explosives, and other substances of which trace detection would be of benefit) and mixtures thereof in order to provide information to officials for identification purposes and assists in determinations related to the legality, hazardous nature and/or disposition decision of such substance(s).

Claims

1. A handheld photoemission spectroscopy detections system comprising:

a. a miniature scanning detection system operating in the ultraviolet to near infrared portion of the electromagnetic spectrum comprising;

i. an excitation light source;

ii. a bandpass filter;

iii. a low-pass spectral filter;

iv. an ultraviolet fluorescence detector;

b. a processor coupled to the ultraviolet fluorescence detector, the processor receiving spectral data from the ultraviolet fluorescence detector; and

c. a database coupled to said processor that includes signature data for a plurality of predetermined chemical substances.

2. The system of claim 1, wherein said excitation light source comprises at least one of a light emitting diode a laser, a laser diode, a flashlamp and combinations thereof.

3. The system of claim 1, wherein said excitation light source comprises at leased one of a pulsed light source, a square-wave modulated light source, a continuous wave light source and combinations thereof.

4. The system of claim 1, wherein said ultraviolet fluorescence detector comprises at least one of a spectrometer, a spectrally filtered photodetectors, and combinations thereof.

5. The system of claim 1, further comprising a concentrator comprising a vacuum device operatively coupled to said system.

6. The system of claim 1, further comprising a GPS locater.

7. The system of claim 1, wherein said system has a functional standoff distance of approximately 2 inches to approximately 12 inches.

8. The system of claim 1, wherein said system has a measurement footprint of approximately 1 inch to approximately 2.75 inches.

9. The system of claim 1, wherein said system communicates wirelessly with at last one remote location.

10. The system of claim 9, wherein said at least one remote location houses at least one of said processor coupled to the ultraviolet fluorescence detector and said database coupled to said processor.

11. The system of claim 1, further comprising at least one remote access communication device.

12. The system of claim 1, wherein said system determines the distance to a target in order to keep said system within a sensitive range.

13. The system of claim 1, further comprising at least one of optics, a spectrograph and a detector array.

14. The system of claim 1, wherein said system operates with a radiation wavelength range of approximately 200 nanometers to approximately 1800 nanometers.

15. The system of claim 1, wherein said system is used to detect at least one of methamphetamine, cocaine, heroin, marijuana, TATP, TNT, RDX, C4, PETN, Black Powder, Smokeless Powder, A.N.F.O., Semtex, Tetry and combinations thereof.

16. Use of the system of claim 1 for at least one of detecting multiple chemical compounds or constituents in the chemical or petroleum industries;

measuring internal pollution and contamination controls;

measuring external pollution and contamination controls;

illegal drug detection and monitoring;

commercial drug quality control and dispensing verification;

nuclear waste and effluent monitoring;

air standards determination;

explosives monitoring and detection;

semiconductor industry effluent monitoring and control;

hazardous waste and emission monitoring;

semiconductor quality control measurement;

semiconductor processing contamination monitoring and control;

plasma monitoring and control;

waste dump site monitoring and control;

nuclear, biological, and chemical weapons by-products monitoring;

clean room monitoring and control;

clean room tools monitoring;

vacuum control monitoring;

laminar flow control monitoring;

security monitoring;

military and civilian ship and building security;

drug security monitoring;

explosive monitoring;

weapons and bio-hazard manufacturing, detection and storage; and

remediation.