Document Type

Article

Journal/Book Title/Conference

Atmospheric Measurement Techniques

Volume

6

Publication Date

11-28-2013

First Page

3271

Last Page

3280

DOI

10.5194/amt-6-3271-2013

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 de-sign of the inlet and lens was optimized with computational fluid dynamics (CFD) modeling of particle trajectories. Ma-jor 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 char-acterized experimentally with size-selected particles. Exper-imental measurements are in good agreement with the calcu-lated transmission efficiency

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