Penetration Calibration and Verification for the Solid Particle Counting System with Polydisperse and Monodisperse Particles

2008 ◽  
Vol 1 (1) ◽  
pp. 593-602 ◽  
Author(s):  
Qiang Wei ◽  
Mike Akard ◽  
Ichiro Asano ◽  
Montajir Rahman
Keyword(s):  
Solid Particle ◽  
Monodisperse Particles ◽  
Counting System ◽  
Particle Counting ◽  
Calibration And Verification

Soot Emission Behavior from Diverse Vehicles and Catalytic Technologies Measured by a Solid Particle Counting System

2007 ◽  
Author(s):  
Rahman M. Montajir ◽  
Takeshi Kusaka ◽  
Inoue Kaori ◽  
Nobutaka Kihara ◽  
Ichiro Asano ◽  
...  
Keyword(s):  
Solid Particle ◽  
Soot Emission ◽  
Counting System ◽  
Particle Counting ◽  
Emission Behavior

scholarly journals Experimental characterization of the COndensation PArticle counting System for high altitude aircraft-borne application

2008 ◽  
Vol 1 (1) ◽  
pp. 321-374 ◽  
Author(s):  
R. Weigel ◽  
M. Hermann ◽  
J. Curtius ◽  
C. Voigt ◽  
S. Walter ◽  
...  
Keyword(s):  
High Altitude ◽  
Ambient Pressure ◽  
Particle Diameter ◽  
The Arctic ◽  
Working Fluid ◽  
Counting System ◽  
Dual Channel ◽  
Particle Counting ◽  
Condensation Particle Counting

Abstract. This study aims at a detailed characterization of an ultra-fine aerosol particle counting system for operation on board the Russian high altitude research aircraft M-55 "Geophysica" (maximum ceiling of 21 km). The COndensation PArticle counting Systems (COPAS) consists of an aerosol inlet and two dual-channel continuous flow Condensation Particle Counters (CPCs). The aerosol inlet, adapted for COPAS measurements on board the M-55 "Geophysica", is described concerning aspiration, transmission, and transport losses. The counting efficiencies of the CPCs using the chlorofluorocarbon FC-43 as the working fluid are studied experimentally at two pressure conditions, 300 hPa and 70 hPa. Three COPAS channels are operated with different temperature differences between the saturator and the condenser block yielding smallest detectable particle sizes (dp50 – as 50% detection "cut off" diameters) of 6 nm, 11 nm, and 15 nm, respectively, at ambient pressure of 70 hPa. The fourth COPAS channel is operated with an aerosol heating line (250°C) for a determination of the non-volatile number of particles. The heating line is experimentally proven to volatilize pure H2SO4-H2O particles for a particle diameter (dp) range of 11 nm<dp<200 nm. Additionally this study includes investigation to exclude auto-nucleation of the working fluid inside the CPCs. An instrumental inter-comparison (cross-correlation) has been performed for several measurement flights and mission flights in the Arctic and the Tropics are discussed. Finally, COPAS measurements are used for an aircraft plume crossing analysis.

A particle counting system for calculation of bedload fluxes

2016 ◽  
Vol 27 (12) ◽  
pp. 125305 ◽  
Author(s):  
Luís Mendes ◽  
Federica Antico ◽  
Pedro Sanches ◽  
Francisco Alegria ◽  
Rui Aleixo ◽  
...  
Keyword(s):  
Counting System ◽  
Particle Counting

scholarly journals Experimental characterization of the COndensation PArticle counting System for high altitude aircraft-borne application

2009 ◽  
Vol 2 (1) ◽  
pp. 243-258 ◽  
Author(s):  
R. Weigel ◽  
M. Hermann ◽  
J. Curtius ◽  
C. Voigt ◽  
S. Walter ◽  
...  
Keyword(s):  
High Altitude ◽  
Particle Diameter ◽  
Correlation Coefficients ◽  
Experimental Characterization ◽  
Counting System ◽  
Dual Channel ◽  
Particle Counting ◽  
Flow Condensation ◽  
Condensation Particle Counting

Abstract. 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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