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Concentrating particles in a turbulent gas flow may include receiving, in a receptacle, a turbulent gas flow that includes particles. The concentration of particles in a gas flow exiting the receptacle at a first port is increased as compared with a concentration of the particles in the gas flow rec

Concentrating particles in a turbulent gas flow may include receiving, in a receptacle, a turbulent gas flow that includes particles. The concentration of particles in a gas flow exiting the receptacle at a first port is increased as compared with a concentration of the particles in the gas flow received by the receptacle. The increased concentration of particles is accomplished by removing a portion of the gas flow by using a second port, and fluidly communicating the gas flow through a tube in the receptacle. The tube has a smaller diameter at the end of the tube at which the gas flow exits the tube than diameter at the end of the tube at which the gas flow is received.

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1. A method for concentrating particles in a turbulent gas flow, the method comprising: receiving, in a receptacle, a turbulent gas flow including particles, the receptacle comprising a cone section having an inlet and an outlet, a diameter of the inlet of the cone section being greater than a diame

1. A method for concentrating particles in a turbulent gas flow, the method comprising: receiving, in a receptacle, a turbulent gas flow including particles, the receptacle comprising a cone section having an inlet and an outlet, a diameter of the inlet of the cone section being greater than a diameter of the outlet of the cone section; andincreasing a concentration of particles in a gas flow exiting the receptacle at a first port as compared with a concentration of the particles in the turbulent gas flow received by the receptacle by: fluidly communicating the turbulent gas flow from the inlet of the cone section towards a gap, the gap being at the outlet of the cone section and between the outlet of the cone section and the first port; andremoving a portion of the turbulent gas flow at the gap. 2. The method of claim 1, wherein receiving the turbulent gas flow comprises: receiving the turbulent gas flow at an input tube; andfluidly communicating the turbulent gas flow from the input tube to the cone section. 3. The method of claim 1, further comprising passing the gas flow exiting the receptacle at the first port through a particle collector to deposit at least a portion of the particles on the particle collector. 4. The method of claim 3, wherein the particle collector comprises a low-porosity mesh or fiber. 5. The method of claim 3, wherein the particle collector is configured to be processed by an analyzer to determine whether the portion of the particles comprises energetic material. 6. The method of claim 3, wherein the portion of the particles comprises particles having a diameter of 0.10 microns or more. 7. The method of claim 1, wherein fluidly communicating the turbulent gas flow from the inlet of the cone section towards a gap comprises directing the turbulent gas flow towards the gap and the first port. 8. The method of claim 7, wherein directing the turbulent gas flow comprises maintaining vacuum pressure at the first port and at a second port fluidly connected to the gap. 9. The method of claim 8, wherein the vacuum pressure at the second port is greater than the vacuum pressure at the first port. 10. The method of claim 7, wherein directing the turbulent gas flow comprises operating a vacuum pump to fluidly communicate the turbulent gas flow from a gas flow source towards the gap and the first port. 11. The method of claim 1, wherein the received turbulent gas flow has a flow rate between 10 and 60 liters per second. 12. The method of claim 1, wherein the received turbulent gas flow has a flow rate between 1 and 100 liters per second. 13. The method of claim 1, wherein the received turbulent gas flow has a flow rate of greater than 2 liters per second. 14. The method of claim 1, further comprising receiving, at a bypass port, the portion of the turbulent gas flow removed at the gap. 15. The method of claim 1, wherein fluidly communicating the turbulent gas flow towards the gap comprises communicating the gas from the gas flow through a ring, the ring comprising a ring wall defining a plurality of holes that substantially surround the gap. 16. The method of claim 1, wherein receiving the gas flow comprises receiving a non-condensable, turbulent gas flow. 17. The method of claim 1, wherein the receptacle further comprises one or more other cone sections, each of the cone sections comprising an inlet and an outlet, a diameter of the inlet being greater than a diameter of the outlet, wherein the one or more other cone sections are arranged in a sequence such that any two of the cone sections are separated by a respective gap along a direction of flow; andwherein the particle concentration is increased by: fluidly communicating gas from the turbulent gas flow through each of the cone sections in sequence; andremoving a respective portion of the turbulent gas flow from the receptacle at the respective gaps. 18. The method of claim 1, wherein increasing a concentration of particles in a gas flow exiting the receptacle at a first port as compared with a concentration of the particles in the turbulent gas flow received by the receptacle comprises increasing a concentration of particles of an explosive material.