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Proceedings Paper

A miniaturized laser-diode-based optical sensor for laser particle counter
Author(s): Chunlei Liang; Huijie Huang; Bingqiang Ren; Yongkai Zhao
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Paper Abstract

A miniature optical sensor for laser particle counter is described, and some calculated and test results are reported in this paper. A reflective spherical mirror coated with highly reflective optical film is applied as collecting element for scattered light, and a PIN photodiode with high performance is used as the photo-detector. A band-pass preamplifier is used to eliminate lower-frequency electromagnetic interference from external environment, as well as to filter high-frequency components from electronic noise. An air sampling system can provide a very constant flow rate. The smallest particle diameter of the optical sensor is 0.3 microns with a signal-to-noise ratio exceeding 2:1.

Paper Details

Date Published: 14 February 2005
PDF: 6 pages
Proc. SPIE 5634, Advanced Sensor Systems and Applications II, (14 February 2005); doi: 10.1117/12.572789
Show Author Affiliations
Chunlei Liang, Shanghai Institute of Optics and Fine Mechanics, CAS (China)
Wuhan Institute of Chemical Technology (China)
Huijie Huang, Shanghai Institute of Optics and Fine Mechanics, CAS (China)
Bingqiang Ren, Shanghai Institute of Optics and Fine Mechanics, CAS (China)
Yongkai Zhao, Shanghai Institute of Optics and Fine Mechanics, CAS (China)


Published in SPIE Proceedings Vol. 5634:
Advanced Sensor Systems and Applications II
Yun-Jiang Rao; Osuk Y. Kwon; Gang-Ding Peng, Editor(s)

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