Abstract
While the performance of electrostatic microphones with foil electrets is similar in many respects to that of conventional condenser microphones, they have considerably higher capacitance and do not require a dc bias. Recent studies on electret microphones have been extended to a number of dielectric materials. Measurements of the change in sensitivity as a function of time indicate that microphones with fluorocarbon electrets are superior to systems with polyester electrets at room temperature and at elevated temperatures. The results also indicate that the change in sensitivity of electret microphones depends on the stability of the surface charge of foil electrets and on mechanical parameters of the system.
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