| 摘要 |
The invention relates to virtual impactors with slits. Virtual impactors serve to enrich aerosol particles of certain orders of magnitude from gases, particularly from the ambient air, for the purpose of examining such particles. For very high degrees of enrichment to many hundreds of times the initial concentration very effective multistage virtual impactors have been developed with hundreds of nozzles but the latter are difficult to manufacture and clean. In principle the individual nozzles can be replaced by slits which are easier to manufacture. Since the ends of the slits cause considerable stability problems for the stream of gas the invention proposes using circular slits without ends.
|
