Systems for differential ion mobility analysis
Disclosed herein are systems, methods and apparatus, for detection and identification of analytes in a volatilized or volatilizable sample, using the mobility-based signature that is produced when the volatilized sample is passed through an ion mobility based analyzer.
1. A method for detecting smoke comprising:
ionizing a portion of an airborne sample into ions, and
filtering a portion of the ions for at least one marker associated with combustion within the sample using an ion mobility based filter to identify ions associated with the at least one marker.
2. The method of claim 1 , wherein the filtering includes flowing the sample through an asymmetric field.
3. The method of claim 2 comprising applying a compensation field to the asymmetric field to selectively pass ions through the asymmetric field.
4. The method of claim 3 comprising controlling at least one condition of filtering.
5. The method of claim 4 comprising storing information about conditions of filtering of at least one known marker and adjusting the conditions of filtering to enable the at least one known marker to pass through the asymmetric field.
6. The method of claim 4 comprising storing information about conditions of filtering of a plurality of known markers and scanning at least one condition of filtering to enable the plurality of known markers to pass through the asymmetric field.
7. The method of claim 1 comprising eluting a portion of the sample from a gas chromatograph before one of ionizing and filtering the ions.
8. The method of claim 1 comprising pre-filtering the sample using a membrane.
9. The method of claim 8 , wherein the membrane includes at least one polymer.
10. The method of claim 9 , wherein the polymer includes one of Teflon® and dimethyl silicone.
11. The method of claim 1 comprising pre-filtering the sample to remove unwanted components.
12. The method of claim 1 , wherein the marker includes a volatile organic compound.
13. The method of claim 12 , wherein the volatile organic compound is derived from at least one of building materials, packaging materials, cigarettes, synthetic polymers, organic materials, fabric, cellulose-based materials, wood, cotton, paper, and grass.
14. The method of claim 1 , wherein the marker includes one or more of carbon, carbon dioxide, nicotine, alkanes, gasoline, petroleum, and natural gas.
15. An ion mobility based smoke detection system comprising:
a sample introduction section for collecting an airborne sample, the sample possibly including at least one combustion marker,
an ion source for ionizing a portion of the sample,
an ion mobility based filter for filtering out the at least one combustion marker, and
a detector for detecting the at least one combustion marker.
16. The system of claim 15 , wherein the passing through includes flowing the sample through an asymmetric field.
17. The system of claim 16 , wherein the filter is configured to apply a compensation field to the asymmetric field to selectively pass ions through the filter.
18. The system of claim 17 comprising an electronic controller for controlling at least one condition of the filter.
19. The system of claim 18 , wherein the controller is configured for storing information about filter conditions associated with filtering at least one known marker and adjusting the filter conditions to enable the at least one known marker to pass through the asymmetric field.
20. The system of claim 18 , wherein the controller is configured for storing information about filter conditions associated with filtering a plurality of known markers and scanning the filter conditions to enable the plurality of known markers to pass through the asymmetric field.
21. The system of claim 15 comprising a gas chromatograph from which a portion of the sample is eluted before one of ionizing and pass through the ions.
22. The system of claim 15 comprising a pre-filter for filtering the sample using a membrane.
23. The system of claim 22 , wherein the membrane includes at least one polymer.
24. The system of claim 23 , wherein the polymer includes one of Teflon® and dimethyl silicone.
25. The system of claim 15 comprising a pre-filter for removing unwanted components.
26. The system of claim 15 , wherein the marker includes a volatile organic compound.
27. The system of claim 26 , wherein the volatile organic compound is derived from at least one of building materials, packaging materials, cigarettes, synthetic polymers, organic materials, fabric, cellulose-based materials, wood, cotton, paper, and grass.
28. The method of claim 15 , wherein the marker includes one or more of carbon, carbon dioxide, nicotine, alkanes, gasoline, petroleum, and natural gas.
29. A method for identifying the source material of a fire comprising:
ionizing a portion of an airborne sample into ions,
filtering the ions for at least one marker within the sample using an ion mobility based filter, the marker being associated with at least one volatile organic compound, the volatile organic compound being associated with at least one source material,
identifying the at least one marker by detecting ions associated with the at least one marker.
30. The method of claim 29 , wherein the source material includes material derived from at least one of building materials, packaging materials, cigarettes, synthetic polymers, organic materials, fabric, cellulose-based materials, wood, and paper.
31. The method of claim 29 , wherein the filtering includes flowing the sample through an asymmetric field.
32. The method of claim 31 comprising applying a compensation field to the asymmetric field to selectively pass ions through the asymmetric field.