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Williams, L. R; Gonzalez, L. A; Peck, J; Trimborn, D; McInnis, J; Farrar, M. R; Moore, K. D; Jayne, J. T; Robinson, W. A; Lewis, D. K; Onasch, T. B; Canagaratna, M. R; Trimborn, A; Timko, M. T; Magoon, G; Deng, R; Tang, D; de la Rosa Blanco, E; Prévôt, A. S. H; Smith, K. A; Worsnop, D. R
Atmospheric measurement techniques, 11/2013, Letnik: 6, Številka: 11Journal Article
We have designed and characterized a new inlet and aerodynamic lens for the Aerodyne aerosol mass spectrometer (AMS) that transmits particles between 80 nm and more than 3 μm in vacuum aerodynamic diameter. The design of the inlet and lens was optimized with computational fluid dynamics (CFD) modeling of particle trajectories. Major changes include a redesigned critical orifice holder and valve assembly, addition of a relaxation chamber behind the critical orifice, and a higher lens operating pressure. The transmission efficiency of the new inlet and lens was characterized experimentally with size-selected particles. Experimental measurements are in good agreement with the calculated transmission efficiency.
