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A concentrator for increasing the particle concentration in an aerosol flow is described. The concentrator comprises a sculptured acceleration plate with a number of slit-shaped and radially extending acceleration channels and a sculptured deceleration plate with a number of slit-shaped and radially

A concentrator for increasing the particle concentration in an aerosol flow is described. The concentrator comprises a sculptured acceleration plate with a number of slit-shaped and radially extending acceleration channels and a sculptured deceleration plate with a number of slit-shaped and radially extending deceleration plate channels. Acceleration channel exit openings are spaced from a base surface on an exit side of the acceleration plate and sculptured deceleration channel entry openings are spaced from a base surface on an entry side of the deceleration plate so that a relatively large gap is provided between the acceleration plate base surface and the deceleration plate base surface allowing a waste volume flow to be exhausted through this relatively large gap at low flow resistance. The plurality of openings comprises openings of at least two different lengths.

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1. A concentrator for increasing the particle concentration in an aerosol flow, the concentrator comprising:a sculptured acceleration plate with a number of slit-shaped and radially extending entry openings adapted to receive a first aerosol volume flow and having a first cumulative cross-sectional

1. A concentrator for increasing the particle concentration in an aerosol flow, the concentrator comprising:a sculptured acceleration plate with a number of slit-shaped and radially extending entry openings adapted to receive a first aerosol volume flow and having a first cumulative cross-sectional size, and a number of slit-shaped and radially extending acceleration plate exit openings adapted to release the first aerosol volume flow and having a second cumulative cross-sectional size that is smaller than the first cumulative cross-sectional size;a sculptured deceleration plate with a number of slit-shaped and radially extending deceleration plate entry openings adapted to receive a second aerosol volume flow of high particle concentration and having a third cumulative cross-sectional size, and a number of slit-shaped and radially extending deceleration plate exit openings adapted to release the second aerosol volume flow and having a fourth cumulative cross-sectional size that is larger than the third cumulative cross-sectional size; whereinsculptured acceleration channels extend between the acceleration plate entry openings and the acceleration plate exit openings and sculptured deceleration channels extend between the deceleration plate entry openings and the deceleration plate exit openings;the acceleration plate exit opening are spaced from a base surface on an exit side of the acceleration plate and the sculptured deceleration channel entry openings are spaced from a base surface on an entry side of the deceleration plate;a gap is provided between the acceleration plate base surface and the deceleration plate base surface, the gap being adapted to release a third volume flow of low particle concentration; andthe acceleration plate exit openings overlap substantially with the deceleration plate entry openings, the openings extend from a location closer to a center of the respective acceleration and deceleration plates in radial direction to a location closer to an outer periphery of the respective acceleration plate and deceleration plate; andthe plurality of openings comprises openings of at least two different lengths. 2. The concentrator according to claim 1, wherein a first group of longer slit-shaped openings extend from a location close to the center to a location closer to the outer periphery of the acceleration plate and deceleration plate while a second group of shorter slit-shaped openings extend from a location spaced from the center to a location closer to the outer periphery. 3. The concentrator according to claim 2, wherein a third group of intermediate slit-shaped openings having a length in between the first and second group of longer and shorter openings, respectively, extends from a location spaced from the center to a location closer to the outer periphery and is spaced by a shorter distance from the center than of the second group of slit-shaped openings. 4. The concentrator according to claim 3, wherein the slit-shaped openings of the first group of openings comprises four slit-shaped openings that are circumferentially spaced by an angle of 90 degrees with respect to each other, the third group of slit-shaped openings comprises four slit-shaped openings that are circumferentially spaced by an angle of 90 degrees with respect to each other and 45 degrees with respect to respective adjacent slit-shaped openings of the first group of slit-shaped openings, and the second group of slit-shaped openings comprises eight openings that are circumferentially spaced by an angle of 45 degrees with respect to each other and 22.5 degrees with respect to respective adjacent openings of the first and third group of slit-shaped openings. 5. The concentrator according to claim 1, further comprising a connector comprising one of a raised locator at the deceleration plate and corresponding indented receptacle at the acceleration plate or a raised locator at the acceleration plate and corresponding indented receptacle at the deceleration plate for positioning the acceleration and deceleration plates in radial and circumferential direction with respect to each other such that the acceleration and deceleration plates are aligned to be parallel to each other and spaced apart by gap and with respect to each other, wherein the alignment includes the angular orientation in circumferential direction such that the acceleration plate exit openings are substantially aligned with the deceleration plate entry openings. 6. The concentrator according to claim 5, wherein the raised locator and the corresponding indented receptacle are cross-shaped. 7. The concentrator according to claim 1, wherein the slit-shaped acceleration plate exit openings are 0.4-1.6 mm wide, the deceleration plate entry openings are 0.6-2 mm wide, the cumulative length of the acceleration nozzles is 10-25 cm, and the gap between the acceleration plate base surface and the deceleration plate base surface is 0.8-2 cm. 8. The concentrator according to claim 1, wherein the assembled acceleration plate and deceleration plate are enclosed in a cowling comprising a radial opening through which the third volume flow is guided to an exhaust port. 9. The concentrator according to claim 1, comprising such a concentration efficiency that 85% of the particles in the first volume flow are comprised in the second volume flow, while the third volume flow comprises only 15 percent of the particles from the first volume flow. 10. The concentrator according to claim 1, wherein the second volume flow comprises 10-20% of the first volume flow while the third volume flow comprises 80-90% of the first volume flow. 11. The concentrator according to claim 1, wherein a flow pressure drop across the concentrator is 1 mm of water or less at a gas flow rate of up to 250 liters per minute with a output aerosol flow of 40 liters per minute. 12. The concentrator according to claim 1, wherein at least some of the deceleration channels widen from the entry opening in the direction of the exit openings of the deceleration plate progressively and a wall of the deceleration channel comprises one of the shapes linear, convex or parabolic. 13. The concentrator according to claim 1, wherein at least some of the acceleration channels narrow from the entry openings in the direction of the exit openings of the deceleration plate progressively and a wall of the acceleration channel comprises one of the shapes linear, convex or parabolic. 14. The concentrator according to claim 1, further comprising an eddy relaxation chamber to decay the deceleration eddys prior to the aerosol being constricted into an output port by a cone shaped collector. 15. The concentrator according to claim 14, wherein the cone shaped collector has a wall having a parabolic shape.