Hand-held trace vapor/particle sampling system
View Patent ↗A sampling system that contains filter components for collecting and concentrating vapor and particles in high-volume flows. The sample is then vaporized and delivered to a detector at a low-volume flow. The invention also has a sampling probe that contains an air-jet to help dislodge particles from surfaces and a heating lamp to help vaporize compounds on surfaces or objects. The sampling system is especially useful for screening for explosives and other illicit chemicals and toxins on people, baggage, cargo, and other objects.
1. A probe for collecting a trace sample from an object for detection by a detector, comprising:
a housing comprising a nozzle configured to direct a jet of fluid onto the object and a collection line for collecting the trace sample from the object, wherein at least a portion of said collection line is positioned proximate said nozzle;
wherein the collection line comprises a plurality of valves configured to control a flow of the jet of fluid through said nozzle and a flow of the fluid through said collection line in a predetermined sequence that facilitates dislodgment and collection of the trace sample from the object; and
a controller coupled to said plurality of valves for controlling said plurality of valves,
wherein said plurality of valves comprises at least three valves.
2. The probe of claim 1 , wherein the jet of fluid is one of substantially continuous and pulsed.
3. The probe of claim 1 further comprising at least one heating element coupled to said housing.
4. The probe of claim 3 , wherein said at least one heating element comprises an infrared lamp.
5. The probe of claim 1 , wherein said plurality of valves comprises a first valve, a second valve, and a third valve, wherein the sample collection is facilitated when said first valve is open, said second valve is closed, and said third valve is open.
6. The probe of claim 5 , wherein said plurality of valves comprises a fourth valve, wherein said fourth valve is open to facilitate dislodgment of the sample.
7. A method for collecting a trace sample from an object for detection by a detector, comprising:
directing a jet of fluid onto the object through at least one nozzle;
collecting the trace sample from the object through a collection line comprising a plurality of valves, wherein at least a portion of the collecting line is positioned proximate the nozzle; and
controlling a flow of the jet of fluid through the at least one nozzle and a flow of the fluid through the plurality of collection line valves in a predetermined sequence, thereby facilitating dislodgement and collection of the trace sample from the object,
wherein said plurality of valves comprises at least three valves.
8. The method of claim 7 , wherein the jet of fluid is controlled to be one of continuous and pulsed.
9. The method of claim 7 further comprising heating the object.
10. The method of claim 9 , wherein said heating the object comprises energizing at least one heating element.
11. The method of claim 10 , wherein said energizing at least one heating element comprises energizing at least one infrared lamp.
12. The method of claim 7 , wherein said controlling the flow of the fluid through the plurality of collection line valves in a predetermined sequence comprises opening a first valve, closing a second valve, and opening a third valve.