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Proceedings Paper

Development of polarization optical particle counter to detect particle shape information
Author(s): Hiroshi Kobayashi; Masahiko Hayashi; Yoshinobu Nakura; Takayuki Enomoto; Kazuhiko Miura; Hiroshi Takahashi; Yasuhito Igarashi; Hiroaki Naoe; Tomoaki Nishizawa; Nobuo Sugimoto; Naoki Kaneyasu
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Paper Abstract

Polarization optical particle counter (POPC) capable of measuring particle shape or sphericity was developed, which uses detection of polarization of light scattered by particles. Sensors that detected P and S polarization components are incorporated at scattering angle of 120˚ in addition to ordinary sensor located at the angle of 60˚. The particle size is derived from the pulse height detected with the ordinary sensor. The size thresholds were determined by measurements of PSL standard particles. Polarization of particle is calculated as the ratio of S polarization component to the sum of all components. The POPC field observations were started in Fukuoka, Japan on 15 March 2012 and in Matsue, Japan on 28 February 2012. Air pollution with high particle number concentration was observed in Fukuoka on 11 April. In that time, the particles with polarization lower than 0.3 constituted 90% of particles in the size range from 0.5 µm to 3 µm and 70-90% of those from 3 µm to 5 µm. Most of the atmospheric aerosol particles were consisted of spherical particles. Significant Asian dust transport was observed in Fukuoka on from 31 March to 1 April. The particles with polarization lower than 0.3 constituted 80% of those from 0.5 µm to 1 µm, 55-65% of those from 1 µm to 5µm. The increase of the ratio of non-spherical particles to all particles in Asian dust event was confirmed. The POPC thus is capable of measuring particle shape as well as size for each individual particle.

Paper Details

Date Published: 19 November 2012
PDF: 8 pages
Proc. SPIE 8526, Lidar Remote Sensing for Environmental Monitoring XIII, 852609 (19 November 2012); doi: 10.1117/12.979634
Show Author Affiliations
Hiroshi Kobayashi, Univ. of Yamanashi (Japan)
Masahiko Hayashi, Fukuoka Univ. (Japan)
Yoshinobu Nakura, Yamanashi Gijyutsu Kobo (Japan)
Takayuki Enomoto, Tokyo Univ. of Science (Japan)
Kazuhiko Miura, Tokyo Univ. of Science (Japan)
Hiroshi Takahashi, Meteorological Research Institute (Japan)
Yasuhito Igarashi, Meteorological Research Institute (Japan)
Hiroaki Naoe, Japan Meteorological Agency (Japan)
Tomoaki Nishizawa, National Institute for Environmental Studies (Japan)
Nobuo Sugimoto, National Institute for Environmental Studies (Japan)
Naoki Kaneyasu, National Institute of Advanced Industrial Science and Technology (Japan)

Published in SPIE Proceedings Vol. 8526:
Lidar Remote Sensing for Environmental Monitoring XIII
Kazuhiro Asai; Nobuo Sugimoto; Upendra N. Singh; Achuthan Jayaraman; Jianping Huang; Detlef Mueller, Editor(s)

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