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Sensors 2010, 10(4), 3641-3654; doi:10.3390/s100403641

A Miniature System for Separating Aerosol Particles and Measuring Mass Concentrations

1,* , 2
Received: 3 February 2010 / Revised: 6 April 2010 / Accepted: 7 April 2010 / Published: 12 April 2010
(This article belongs to the Section Physical Sensors)
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We designed and fabricated a new sensing system which consists of two virtual impactors and two quartz-crystal microbalance (QCM) sensors for measuring particle mass concentration and size distribution. The virtual impactors utilized different inertial forces of particles in air flow to classify different particle sizes. They were designed to classify particle diameter, d, into three different ranges: d < 2.28 μm, 2.28 μm ≤ d ≤ 3.20 μm, d > 3.20 μm. The QCM sensors were coated with a hydrogel, which was found to be a reliable adhesive for capturing aerosol particles. The QCM sensor coated with hydrogel was used to measure the mass loading of particles by utilizing its characteristic of resonant frequency shift. An integrated system has been demonstrated.
Keywords: microbalance sensor; virtual impactor; aerosol particle microbalance sensor; virtual impactor; aerosol particle
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Liang, D.; Shih, W.-P.; Chen, C.-S.; Dai, C.-A. A Miniature System for Separating Aerosol Particles and Measuring Mass Concentrations. Sensors 2010, 10, 3641-3654.

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