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This paper takes a detailed look at the operation of the electrostatic soot sensor and its potential use to monitor motor vehicle particulate matter emissions. Charged soot particles entering the sensor are trapped and grow into dendritic soot structures aligned with the electric field. Above a critical length, the electrostatic force fractures the dendrites, producing fragments that carry sufficient...
This paper examines the surprisingly large electrical current, nanoamps instead of picoamps, observed when sampling soot aerosol through an electrostatic trap. Aside from its fundamental interest, this phenomenon has potential practical application to motor vehicle on-board diagnostics of particulate matter emissions. The effect originates from the collection of electrically charged particles naturally...
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