Detection of Soot Using a Resistivity Sensor Device Employing Thermophoretic Particle Deposition

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Results are reported for thermophoretic deposition of soot particles on resistivity sensors as a monitoring technique for diesel exhaust particles with the potential of improved detection limit and sensitivity. Soot with similar characteristics as from diesel exhausts was generated by a propane flame and diluted in stages. The soot in a gas flow at 240–270C∘ was collected on an interdigitated electrode structure held at a considerably lower temperature, 105–125C∘. The time delay for reaching measurable resistance values, the subsequent rate, and magnitude of resistance decrease were a function of the distance between the fingers in the electrodes and the degree of dilution of the soot containing flow. Soot deposition and subsequent removal by heating the sensor support was also performed in a real diesel exhaust. Good similarities between the behavior in our laboratory system and the real diesel exhaust were noticed.


  • Doina Lutic
  • Joakim Pagels
  • Robert Björklund
  • Peter Josza
  • Jacobus H. Visser
  • Ann W. Grant
  • Mats L. Johansson
  • Jaska Paaso
  • Per-Erik Fägerman
  • Mehri Sanati
  • Anita Lloyd Spetz
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Production Engineering, Human Work Science and Ergonomics
Original languageEnglish
Article number421072
JournalJournal of Sensors
Publication statusPublished - 2010
Publication categoryResearch

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