Particle and aerosol research (한국입자에어로졸학회지)

Korean Association for Particle and Aerosol Research (한국입자에어로졸학회)
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Experimental analysis on effects of nozzle diameter on detection characteristics of an optical particle counter

광학식 입자 계수기 내 샘플 노즐 직경이 측정 효율 및 특성에 미치는 영향에 대한 실험적 연구

  • Song, Hyunwoo (Graduate School of Mechanical Engineering, Yonsei University) ;
  • Kim, Taewook (Graduate School of Mechanical Engineering, Yonsei University) ;
  • Song, Soonho (Mechanical Engineering, Yonsei University)
  • 송현우 (연세대학교 기계공학과 대학원) ;
  • 김태욱 (연세대학교 기계공학과 대학원) ;
  • 송순호 (연세대학교 기계공학과)
  • Received : 2017.10.18
  • Accepted : 2017.11.19
  • Published : 2017.12.31
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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.

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References

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