Modelling the electromechanical film (EMFi)

Mika Paajanen (Corresponding Author), Hannu Välimäki, Jukka Lekkala

Research output: Contribution to journalArticleScientificpeer-review

101 Citations (Scopus)


The porous EMFi electret film is modelled using a simplified one air gap structure. Linear models for the sensor and actuator thickness operation modes of the film are identical, which shows the reciprocity of the sensor and actuator models. Using the models with some experimental data the film's Young's modulus, sensitivity and charge density on the polypropylene/air void interfaces are determined. The effect of the charges near the surfaces seems to be negligible. The electromechanical transducer constant or the sensitivity values are higher using a pseudo-static actuator measurement compared to a dynamic sensor measurement associated with some static pressure.

Original languageEnglish
Pages (from-to)193 - 204
Number of pages12
JournalJournal of Electrostatics
Issue number3-4
Publication statusPublished - 2000
MoE publication typeA1 Journal article-refereed

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