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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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Atmos. Meas. Tech., 6, 3271-3280, 2013
https://doi.org/10.5194/amt-6-3271-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
28 Nov 2013
Characterization of an aerodynamic lens for transmitting particles greater than 1 micrometer in diameter into the Aerodyne aerosol mass spectrometer
L. R. Williams1, L. A. Gonzalez2, J. Peck1, D. Trimborn3, J. McInnis4, M. R. Farrar5, K. D. Moore6, J. T. Jayne1, W. A. Robinson1, D. K. Lewis1,7, T. B. Onasch1, M. R. Canagaratna1, A. Trimborn3, M. T. Timko1,8, G. Magoon1, R. Deng9, D. Tang10, E. de la Rosa Blanco1, A. S. H. Prévôt11, K. A. Smith12, and D. R. Worsnop1 1Aerodyne Research, Inc., Billerica, MA, USA
2CoolChip Technologies, Boston, MA, USA
3AeroMegt, Hilden, Germany
4Department of Chemistry, Northwestern University, Evanston, IL, USA
5Cambridge Rindge and Latin High School, Cambridge, MA, USA
6Space Dynamics Laboratory, Utah State University Research Foundation, North Logan, UT, USA
7Department of Chemistry, Connecticut College, New London, CT, USA
8Department of Chemical Engineering, Worcester Polytechnic Institute, Worcester, MA, USA
9Institute of Bioengineering and Nanotechnology, Singapore
10Dynamic Engineering Inc., Houston, TX, USA
11Paul Scherrer Institute, Villigen, Switzerland
12Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
Abstract. 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.

Citation: 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., and Worsnop, D. R.: Characterization of an aerodynamic lens for transmitting particles greater than 1 micrometer in diameter into the Aerodyne aerosol mass spectrometer, Atmos. Meas. Tech., 6, 3271-3280, https://doi.org/10.5194/amt-6-3271-2013, 2013.
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