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公开(公告)号：WO2019099575A1
公开(公告)日：2019-05-23
申请号：PCT/US2018/061131
申请日：2018-11-14
Inventor： WOOLSEY, David , BURNS, David William
IPC: C25B9/08
CPC classification number: G01N1/4022 , B04B5/08 , B04B15/02 , B04B2013/006 , G01N1/2247 , G01N1/2273 , G01N15/02 , G01N15/0272 , G01N15/0606 , G01N15/10 , G01N2001/002 , G01N2015/0046 , G01N2015/0288 , G01N2015/105
Abstract: System for detecting and analyzing particles in an air stream includes an inlet, a particle concentrator and a particle discriminator having an air channel with a cross-sectional geometry that changes within at least one of the inlet, particle concentrator and particle discriminator. The system may have a sheath air stage including a port for providing sample air, at least one sheath air inlet port for providing sheath air, and a sheath air combining region. The system may include an airflow compression stage having a varying air channel that narrows as the air stream traverses the airflow compression stage to pre-concentrate particles within an interior region of the air stream. The system may include an airflow expansion stage having an air channel that widens to slow the airstream and particle velocities. A portion of the air channel height may be narrowed to allow larger thermophoretic forces to be generated.
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公开(公告)号：WO2019099571A1
公开(公告)日：2019-05-23
申请号：PCT/US2018/061127
申请日：2018-11-14
Inventor： WOOLSEY, David , BURNS, David William
CPC classification number: G01N1/4022 , B04B5/08 , B04B15/02 , B04B2013/006 , G01N1/2247 , G01N1/2273 , G01N15/02 , G01N15/0272 , G01N15/0606 , G01N15/10 , G01N2001/002 , G01N2015/0046 , G01N2015/0288 , G01N2015/105
Abstract: A system for analyzing particles in an air stream includes a first heater element configured to deflect particles in an interior region of the air stream towards a peripheral wall of an air channel encompassing the air stream, a second heater element controllable to deflect the particles in a first lateral direction along the peripheral wall, and a third heater element controllable to deflect the particles in a second lateral direction along the peripheral wall. Thermal gradients in the air channel generated by the heater elements may thermophoretically force particles towards the peripheral wall in a direction perpendicular to the air stream to allow thermophoretic forcing and scanning of particles in either the first lateral direction or the second lateral direction along the peripheral wall and onto a surface of a particle detector. Systems and methods for scanning particles with thermophoretic forces are disclosed.
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公开(公告)号：WO2019099570A1
公开(公告)日：2019-05-23
申请号：PCT/US2018/061123
申请日：2018-11-14
Inventor： BLACK, Justin , WOOLSEY, David , BURNS, David William
CPC classification number: G01N1/4022 , B04B5/08 , B04B15/02 , B04B2013/006 , G01N1/2247 , G01N1/2273 , G01N15/02 , G01N15/0272 , G01N15/0606 , G01N15/10 , G01N2001/002 , G01N2015/0046 , G01N2015/0288 , G01N2015/105
Abstract: A system for concentrating particles in an air stream includes an air channel having a first open end and a second open end. The air channel may be enclosed by a channel wall extending from at least the first open to the second open end. Two or more heater elements may be positioned between the first open end and the second open end. The heater elements may be positioned near a periphery of the air channel and cooperatively configured to force particles in the air stream away from the periphery and towards an interior region of the air channel. Particles in the air stream may be thermophoretically forced towards the interior region of the air channel when the heater elements are heated and thermal gradients emanating from the heater elements are generated.
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