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| Titel |
Experimental characterization of the COndensation PArticle counting System for high altitude aircraft-borne application |
| VerfasserIn |
R. Weigel, M. Hermann, J. Curtius, C. Voigt, S. Walter, T. Böttger, B. Lepukhov, G. Belyaev, S. Borrmann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 2, no. 1 ; Nr. 2, no. 1 (2009-06-16), S.243-258 |
| Datensatznummer |
250000441
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| Publikation (Nr.) |
 copernicus.org/amt-2-243-2009.pdf |
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| Zusammenfassung |
| A characterization of the ultra-fine aerosol particle counter COPAS
(COndensation PArticle counting System) for
operation on board the Russian high altitude research aircraft M-55
Geophysika is presented. The COPAS instrument consists of an aerosol inlet
and two dual-channel continuous flow Condensation Particle Counters (CPCs)
operated with the chlorofluorocarbon FC-43. It operates at pressures between
400 and 50 hPa for aerosol detection in the particle diameter (dp)
range from 6 nm up to 1 μm. The aerosol inlet, designed for the M-55,
is characterized with respect to aspiration, transmission, and transport
losses. The experimental characterization of counting efficiencies of three
CPCs yields dp50 (50% detection particle diameter) of 6 nm, 11 nm,
and 15 nm at temperature differences (ΔT) between saturator and
condenser of 17°C, 30°C, and 33°C, respectively. Non-volatile
particles are quantified with a fourth CPC, with dp50=11 nm. It
includes an aerosol heating line (250°C) to evaporate
H2SO4-H2O particles of 11 nm<dp<200 nm at
pressures between 70 and 300 hPa. An instrumental in-flight inter-comparison
of the different COPAS CPCs yields correlation coefficients of 0.996 and
0.985. The particle emission index for the M-55 in the range of 1.4–8.4×1016 kg−1
fuel burned has been estimated based on
measurements of the Geophysika's own exhaust. |
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