| 摘要 |
A particle collector and fractionator having a 360 DEG omnidirectional gas inlet slit is disclosed herein. The collector and fractionator generally comprises a top and bottom fractionating member, each of which has a set of concentric, annular ring projections which are complementary to the other set. The ring projections form channels in the top and bottom members. The collector has at least one standoff for fastening together and spacing the top and bottom fractionating members. The concentric, annular ring projections form rectangular-shaped slits, when viewed in a cross-section. The slits, formed as they are by the ring-like projections, define a gas flow path from the omnidirectional gas inlet slit to a centrally disposed gas outlet port. Particles are collected and fractionated in the channel portions of the concentric, annular ring-like projections whenever particle laden gas flows into the gas flow path and out through the centrally disposed gas port. The minimum aerodynamic size of the particles collected and fractionated may be selected by adjusting the stand-offs so as to vary the cross-sectional area of the gas flow path, which in turn increases or decreases the velocity of a stream of particle laden gas flowing through the path. The cross-sectional areas may all be adjusted simultaneously by the use of the stand-offs.
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