Measuring and testing – Sampler – sample handling – etc. – With constituent separation
Patent
1995-04-27
1996-07-09
Raevis, Robert
Measuring and testing
Sampler, sample handling, etc.
With constituent separation
G01N 100
Patent
active
055334067
ABSTRACT:
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.
REFERENCES:
patent: 3518815 (1970-07-01), McFarland et al.
patent: 4358302 (1982-11-01), Dahneke
patent: 4670135 (1987-06-01), Marple et al.
patent: 4689052 (1987-08-01), Ogren et al.
patent: 4767524 (1988-08-01), Yeh et al.
Design Of A Multi-Stage Virtual Impactor, Novick et al., Elsevier Science Publishing Co., Inc., (1984), pp. 143-145.
Calibration Of A High-Volume Rectangular-Jet Virtual Impactor, Overcamp et al. Aerosols in the Mining and Industrial Work Environments, (1983), pp. 961-969.
Cascade Impactor Sampling & Data Analysis, Lodge, Jr., Ph.D. et al., American Industrial Hygiene Association, (1986).
Virtual Impactors: A Theoretical Study, Marple et al., Environmental Science & Technology, (1980), pp. 976-985.
Bruker-Franzen Analytik GmbH
Raevis Robert
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