Surface sampling mobile chemical detection probe
View Patent ↗A sampling device that contains a heated porous inlet and a transfer line. The device provides sample compounds present as vapor, liquid, or solid, in air, or on surfaces such as soil. The sample device can collect and deliver the sample to an analyzer in real time and can operate while in motion such as on a moving vehicle. The sampling device is especially useful to screen toxic and hazardous compounds that might be contaminating an inhabited area.
1. A sampler that collects and transfers a sample to a detector, comprising:
a housing that includes a transfer line;
a porous frit attached to said housing, said porous frit has an exposed outer surface and is in fluid communication with said transfer line;
at least one pump;
a plurality of air jets coupled to said at least one pump, wherein said plurality of air jets are configured to induce a negative pressure; and,
a heater coupled to said housing.
2. The sampler of claim 1 , wherein said at least one pump comprises a first pump in fluid communication with said transfer line.
3. The sampler of claim 2 , further comprising a second pump and a valve that can couple said first or second pump to said transfer line, said first pump creates a negative pressure and said second pump creates a positive pressure within said transfer line.
4. The sampler of claim 1 , further comprising a probe head that includes said air jets.
5. The sampler of claim 1 , further comprising a controller coupled to said at least one pump to provide either a continuous overpressure or a pulse overpressure within said transfer line.
6. The sampler of claim 1 , wherein said housing includes an offset structure that elevates said porous frit from a surface.
7. The sampler of claim 1 , wherein said outer surface of said porous frit has a radial shape.
8. The sampler of claim 1 , wherein said housing can rotate about an axis.
9. The sampler of claim 1 , wherein said housing has an overpressure channel.
10. The sampler of claim 9 , further comprising a valve configured to switch said at least one pump to be in fluid communication with either said transfer line or said overpressure channel.
11. The sampler of claim 1 , wherein said porous frit has a pore size that ranges from about 1 to 500 microns.
12. A method for collecting and transferring a sample to a detector, comprising:
energizing at least one pump;
inducing a negative pressure in a plurality of air jets coupled in flow communication with the at least one pump;
pulling a sample from a surface into a porous frit that is attached to a housing;
heating the sample; and,
transferring the heated sample through a transfer line of the housing to a detector.
13. The method of claim 12 , wherein the porous frit is separated from the surface, wherein the surface includes at least one of outside ground surfaces, soil surfaces, and curved surfaces.
14. The method of claim 12 , wherein the porous frit is in contact with the surface, wherein the surface includes at least one of outside ground surfaces, soil surfaces, and curved surfaces.
15. The method of claim 12 , further comprising moving the porous frit relative to the surface, wherein the surface includes at least one of outside ground surfaces, soil surfaces, and curved surfaces.
16. The method of claim 12 , further comprising purging the porous frit with an overpressure within the transfer line.
17. The method of claim 16 , further comprising switching a valve to change a pressure within the transfer line from a negative pressure to a positive pressure.
18. The method of claim 12 , further comprising agitating the surface with an air jet emitted by the housing.
19. The method of claim 18 , wherein the air jet is either continuous or pulsed.