foil electret

foil electret

[¦fȯil i′lek·trət]
(electricity)
A thin film of strongly insulating material capable of trapping charge carriers, such as polyfluoroethylenepropylene, that is electrically charged to produce an external electric field; in the conventional design, charge carriers of one sign are injected into one surface, and a compensation charge of opposite sign forms on the opposite surface or an adjacent electrode.
References in periodicals archive ?
West studied hard and went on to invent the Foil Electret Microphone.