C-V-testing of electret transducers

A non-destructive method for electret transducers testing is suggested and discussed. The method allows to determine electret-transducers (microphone, telephone, etc.) insert parameters, e.g. electret surface potential air gap width, membrane tension and deflection. The method is based on the insert C-V-characteristic measurements. C-V-testing method can be also used in investigation of electromechanical properties of two roughed surfaces contact, one of the surfaces being dielectric (electret) and allows to optimize the transducer´s geometry and surface potential value