Electrical filter stage for the ELPI

Marko Marjamäki, Leonidas Ntziachristos, Annele Virtanen, Jyrki Ristimäki, Jorma Keskinen, Mikko Moisio, Marko Palonen, Maija Lappi

Research output: Contribution to journalArticleProfessional

58 Citations (Scopus)


Electrical low pressure impactor ELPI was modified to measure particles below 30 nanometers in aerodynamic diameter. This was accomplished by adding a filter stage to collect and measure nanoparticles. The charging unit of the instrument was modified to increase the charging efficiency of the smallest, nanometer sized, particles. The modified charging unit was calibrated and the new construction of the ELPI was tested in laboratory and in vehicle dynamometer test cell. Measurements performed in the engine test cell showed that modifications improve the size range and measurement capability of the ELPI for engine emissions.
Original languageEnglish
Number of pages7
JournalSAE Technical Paper Series
Issue number2002-01-0055
Publication statusPublished - 2002
MoE publication typeD1 Article in a trade journal


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