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http://dx.doi.org/10.11629/jpaar.2017.12.30.159

Experimental analysis on effects of nozzle diameter on detection characteristics of an optical particle counter  

Song, Hyunwoo (Graduate School of Mechanical Engineering, Yonsei University)
Kim, Taewook (Graduate School of Mechanical Engineering, Yonsei University)
Song, Soonho (Mechanical Engineering, Yonsei University)
Publication Information
Particle and aerosol research / v.13, no.4, 2017 , pp. 159-164 More about this Journal
Abstract
The detection efficiency and characteristics of an optical particle counter (OPC), with various sample nozzle outlet diameters, were experimentally investigated. The OPC system, which was built with original design, was made up of a diode laser, two photodetectors, and a variety of optics such as a beam splitter and a concave mirror. The cone-shaped sampling nozzle was designed to be changeable to alter the outlet diameter, within the range of 1 to 3 mm. For samples, sets of polystyrene latex (PSL) standard particle with various sizes of 1 to $3{\mu}m$, were used. As a result, detection efficiency of the OPC greatly decreased with larger nozzle outlet diameter. Moreover, increased nozzle outlet diameter means broader sample flow, thus caused light interference and multiple scattering which results in abnormal high peaks in scattered light signal. The ratio of abnormal peaks to regular signal of single particle increased with larger nozzle outlet diameter.
Keywords
Optical Particle Counter; Light Scattering; Detection Efficiency; Nozzle Diameter;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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