Virtual impactors with slit shaped nozzles without slit ends
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United States of America Patent
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-
Jan 12, 1999
Issued Date -
N/A
app pub date -
Nov 25, 1997
filing date -
Feb 9, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to virtual impactors with slit-shaped nozzles. Virtual impactors serve to enrich aerosol particles of certain magnitudes from gases, particularly from ambient air, for the purpose of examining these particles. For very strong enrichments, reaching up to many hundreds of times the initial concentration, very effective multi-stage virtual impactors with hundreds of nozzles have been developed. However, these are difficult to manufacture and to clean. The individual nozzles can be replaced by slits which are easier to manufacture. With slit-shaped nozzles problems with instability at the ends of the slits occur. The invention describes slit-shaped nozzles, the slits of which have no ends because they are designed as curved, closed figures. By contrast with the prior art which relates to circular slits in parallel plates, here any closed figures are represented, including ones which are not in plane-parallel plates.
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