Particle and Aerosol Research
Vol. 13, No. 4, December 2017, Pages 159-164
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ISSN : 1738-8716 (Print)
ISSN : 2287-8130 (Online)
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Experimental analysis on effects of nozzle diameter on detection
characteristics of an optical particle counter
Hyunwoo Song1), Taewook Kim1), Soonho Song2) *
1)1)Graduate School of Mechanical Engineering, Yonsei University
2)Mechanical Engineering, Yonsei University
*Corresponding author.
Tel.: +82-2-2123-2811, E-mail: soonhosong@yonsei.ac.kr
Received 18 October 2017, Revised 17 November 2017, Accepted 19 November 2017, Available online 03 January 2018
http://dx.doi.org/10.11629/jpaar.2017.12.30.159
Abstracts
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 ¥ìm, 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
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