A miniaturized laser-diode-based optical sensor for laser particle counter

Chunlei Liang; Huijie Huang; Bingqiang Ren; Yongkai Zhao

doi:10.1117/12.572789

14 February 2005 A miniaturized laser-diode-based optical sensor for laser particle counter

Chunlei Liang, Huijie Huang, Bingqiang Ren, Yongkai Zhao

Proceedings Volume 5634, Advanced Sensor Systems and Applications II; (2005) https://doi.org/10.1117/12.572789
Event: Photonics Asia, 2004, Beijing, China

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.

Citation Download Citation

Chunlei Liang, Huijie Huang, Bingqiang Ren, and Yongkai Zhao "A miniaturized laser-diode-based optical sensor for laser particle counter", Proc. SPIE 5634, Advanced Sensor Systems and Applications II, (14 February 2005); https://doi.org/10.1117/12.572789

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