Characterization of an aerodynamic lens for transmitting particles greater than 1 micrometer in diameter into the Aerodyne aerosol mass spectrometer

[摘要] We have designed and characterized a new inlet and aerodynamic lens for theAerodyne aerosol mass spectrometer (AMS) that transmits particles between80 nm and more than 3 μm in vacuum aerodynamic diameter. The design of theinlet and lens was optimized with computational fluid dynamics (CFD)modeling of particle trajectories. Major changes include a redesignedcritical orifice holder and valve assembly, addition of a relaxation chamberbehind the critical orifice, and a higher lens operating pressure. Thetransmission efficiency of the new inlet and lens was characterizedexperimentally with size-selected particles. Experimental measurements arein good agreement with the calculated transmission efficiency.

[学科分类] 几何与拓扑