Modelling the electromechanical film (EMFi)

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

    Research output: Contribution to journalArticleScientificpeer-review

    105 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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