Characterization of a cylindrical tri-axial charger as a critical component in a fast response particulate air pollution sensor
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Each year during the dry and cold season the city of Chiang Mai, a favorite tourist destination in northern Thailand, xperiences high episodes of particulate air pollution. The high concentration of particulates is believed to be due to emissions from forest fires, open burning of dried biomass, and motor vehicles. With the hazards associated with these pollutants, there is an urgent need for a number of continuous particulate matter measuring systems to monitor the level and spatial distribution of the pollutants. In this paper a particulate matter sensor was developed based on the charge measurement principle. For the overall performance of the system, the critical component is the particle charger. A cylindrical tri-axial charging technique was adopted and parametrically investigated. The charging technique was characterized by a low charge loss, the sampling requirements included, and low cost. Preliminary findings showed relatively small change in the charging current in the charging zone when corona and ion-driving voltages were varied. The maximum charging current obtained from the unit can be used successfully in developing a fast PM sensor.
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