For aerosol measurements, especially those concerned with the aerosol particle size distribution, it is important to sample in isokinetic conditions. On the Pennsylvania State University Metereology research aircraft, the air for all aerosol instruments is decelerated in a single isokinetic sampler located above the roof of the cabin outside the aircraft boundary layer.The air enters the sampler through a carefully designed circular intake. Its velocity is reduced as the cross section increases along a 7 deg conical diffuser. The expansion cone terminates in a cylindrical chamber in which the air velocity is 1/16 the aircraft speed. Behind the sampling chamber the air is accelerated in a second conical section to an end exhaust port. Exhaust port 'pumping' is used to compensate internal losses and, thus, helps preserve the isokinetic nature of the sampler.
Isokinetic sampler for continuous airborne aerosol measurements
Isokinetische Probenahme fuer kontinuierliche Aerosolmessungen vom Flugzeug aus
Journal of the Air Pollution Control Association ; 27 , 4 ; 337-341
1977
5 Seiten, 6 Bilder, 1 Tabelle, 8 Quellen
Aufsatz (Zeitschrift)
Englisch
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