Expression of the electrostatic force
The quantity of charges stocked on the electrode is given by
.
The resulting electrostatic force can be written:
|
This formula expresses the electro-mechanical coupling, as an AC electrical signal generates a force that may move the mobile electrode of the transducer.
This transduction is intrinsically non linear as the resulting force is proportional to the square of the excitation voltage: so if q(t) is positive or negative, the electrostatic force results in the electrodes moving together.
