Articles | Volume 13, issue 7
Atmos. Meas. Tech., 13, 3651–3660, 2020
https://doi.org/10.5194/amt-13-3651-2020
Atmos. Meas. Tech., 13, 3651–3660, 2020
https://doi.org/10.5194/amt-13-3651-2020

Research article 08 Jul 2020

Research article | 08 Jul 2020

Application of an O-ring pinch device as a constant-pressure inlet (CPI) for airborne sampling

Sergej Molleker et al.

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AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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AR: Author's response | RR: Referee report | ED: Editor decision
AR by Sergej Molleker on behalf of the Authors (27 May 2020)  Author's response    Manuscript
ED: Publish as is (12 Jun 2020) by Charles Brock
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Short summary
A novel constant-pressure-inlet design for use in airborne aerosol particle mass spectrometry – an aerodynamic lens focuses aerosol particles into a vacuum chamber – is presented. The pressure of a few hectopascals at the lens is precisely controlled over a large flight altitude range up to 21 km. The constant pressure is achieved by changing the inner diameter of a properly scaled flexible O-ring acting as a critical orifice. Particle transmission at various inlet pressures is characterized.