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Sensors 2017, 17(5), 1033; doi:10.3390/s17051033

Fine Particle Sensor Based on Multi-Angle Light Scattering and Data Fusion

State Key Laboratory of Industrial Control Technology, College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China
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Academic Editor: Paul Solomon
Received: 20 February 2017 / Revised: 23 April 2017 / Accepted: 25 April 2017 / Published: 4 May 2017
(This article belongs to the Special Issue Air Pollution Sensors: A New Class of Tools to Measure Air Quality)
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Abstract

Meteorological parameters such as relative humidity have a significant impact on the precision of PM2.5 measurement instruments based on light scattering. Instead of adding meteorological sensors or dehumidification devices used widely in commercial PM2.5 measurement instruments, a novel particle sensor based on multi-angle light scattering and data fusion is proposed to eliminate the effect of meteorological factors. Three photodiodes are employed to collect the scattered light flux at three distinct angles. Weather index is defined as the ratio of scattered light fluxes collected at the 40° and 55° angles, which can be used to distinguish the mass median diameter variation caused by different meteorological parameters. Simulations based on Lorenz-Mie theory and field experiments establish the feasibility of this scheme. Experimental results indicate that mass median diameter has less effect on the photodiode at the 55° angle in comparison with photodiodes at the 40° angle and 140° angle. After correction using the weather index, the photodiode at the 40° angle yielded the best results followed by photodiodes at the 55° angle and the 140° angle. View Full-Text
Keywords: PM2.5; mass concentration; light flux; weather index; relative humidity PM2.5; mass concentration; light flux; weather index; relative humidity
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Shao, W.; Zhang, H.; Zhou, H. Fine Particle Sensor Based on Multi-Angle Light Scattering and Data Fusion. Sensors 2017, 17, 1033.

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