Dr. Hidenori Higashi Profile

Dr. Hidenori Higashi

at Kanazawa Univ

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Proceedings Article | 6 August 2014 Paper

New apparatus of single particle trap system for aerosol visualization

Hidenori Higashi, Tomomi Fujioka, Tetsuo Endo, Chiho Kitayama, Takafumi Seto, Yoshio Otani

Proceedings Volume 9232, 92320Q (2014) https://doi.org/10.1117/12.2063618

KEYWORDS: Particles, Atmospheric particles, Visualization, Aerosols, Light scattering, Signal detection, Particle systems, Aerodynamics, Sensors, Optical proximity correction

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Control of transport and deposition of charged aerosol particles is important in various manufacturing processes. Aerosol visualization is an effective method to directly observe light scattering signal from laser-irradiated single aerosol particle trapped in a visualization cell. New single particle trap system triggered by light scattering pulse signal was developed in this study. The performance of the device was evaluated experimentally. Experimental setup consisted of an aerosol generator, a differential mobility analyzer (DMA), an optical particle counter (OPC) and the single particle trap system. Polystylene latex standard (PSL) particles (0.5, 1.0 and 2.0 μm) were generated and classified according to the charge by the DMA. Singly charged 0.5 and 1.0 μm particles and doubly charged 2.0 μm particles were used as test particles. The single particle trap system was composed of a light scattering signal detector and a visualization cell. When the particle passed through the detector, trigger signal with a given delay time sent to the solenoid valves upstream and downstream of the visualization cell for trapping the particle in the visualization cell. The motion of particle in the visualization cell was monitored by CCD camera and the gravitational settling velocity and the electrostatic migration velocity were measured from the video image. The aerodynamic diameter obtained from the settling velocity was in good agreement with Stokes diameter calculated from the electrostatic migration velocity for individual particles. It was also found that the aerodynamic diameter obtained from the settling velocity was a one-to-one function of the scattered light intensity of individual particles. The applicability of this system will be discussed.

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