Modelling the electromechanical film (EMFi)

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'...

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Bibliographic Details
Published inJournal of electrostatics Vol. 48; no. 3; pp. 193 - 204
Main Authors Paajanen, Mika, Välimäki, Hannu, Lekkala, Jukka
Format Journal Article
LanguageEnglish
Published Elsevier B.V 2000
Subjects
Actuator
Electret film
Electromechanics of films
EMFi
Modelling
Polypropylene
Sensor
Voids
Young's modulus
Voids
Young's modulus
Electret film
Polypropylene
Modelling
EMFi
Electromechanics of films
Sensor
Actuator
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Summary: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.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0304-3886
1873-5738
DOI:10.1016/S0304-3886(99)00065-0