Miniaturized PM2.5 Particulate Sensor Based on Optical Sensing
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Authors
Tong, Zixun
Xiong, Xingguo
Patra, Prabir
Issue Date
2015-04-30
Type
Presentation
Language
en_US
Keywords
Air pollution , Particulate sensor , Simulation
Alternative Title
Abstract
With the rapid economic growth in developing countries, the air pollution is becoming more and more serious. The air in some big cities becomes foggy due to various pollution sources. Particulate matter with diameter of 2.5 microns or less is especially dangerous because they can be inhaled into deep part of lung tissues and eventually absorbed into blood circulation system. This is very harmful for human health, leading to lung cancer and other related diseases. It is important for people to have a handheld PM2.5 sensor to monitor the air pollution to decide whether they should travel or do exercises outdoor. In this research, a miniaturized PM2.5 particulate sensor based on optical sensing is proposed. The air sample flows through a chamber with constant flow rate. Incident laser light pass through the chamber and is reflected by a set of mirrors for multiple times. The light is scattered by the PM2.5 particles in the air sample so that the light intensity is weakened. The higher concentration the PM2.5 is, the more light scattering it will be. By sensing the reflected light intensity with a photodetector, the PM2.5 concentration of the air sample can be measured. Unlike PM2.5 sensing by absorption, optical sensing does not cause any pollution to the device and it can be reused for a long time. The device is designed, analyzed and simulated with COMSOL. It offers a low-cost portable solution for PM2.5 sensing.
Description
© ASEE 2015