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Resistance sensor employing thermophoresis for soot in diesel exhaust

Abstract

To reduce particle emissions from diesel engines, sensors based on resistance change of soot collected on interdigitated electrodes have been introduced [1]. Sensitivity depends on the known mechanisms of soot deposition (convection, diffusion, impact and thermo- phoretic effects). Thermophoresis is a force affecting particles suspended in a gas having a temperature gradient [2]. Collisions with gas molecules coming from the hotter zone result in net movement toward the colder zone for the particles. Sensor surfaces maintained at a cooler temperature than the exhaust gas will thus achieve an effective collection of soot particles less than 100 nm.Thermophoresis show potential for high sensitivty soot sensing for applications such as OBD, On Board Diagnostics.

Category

Academic lecture

Language

English

Author(s)

  • Andreas Larsson

Affiliation

  • SINTEF Digital / Smart Sensor Systems

Presented at

Proc. IEEE Sensors 2009

Place

Christchurch, New Zealand

Date

25.10.2009 - 28.10.2009

Organizer

IEEE

Year

2009

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