Capacitive transducers, Other Engineering

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Capacitive transducers

Consider a capacitor consisting of two parallel conducting plates with an insulator in between.

1558_Capacitive transducers.png

Its capictance is C = ε0εA/d

where εo is the dielectric constant of the vacuum, εr is the dielectric constant of the insulator, A is the area of the plates, and d is the distance between them.

Any one of these three variables can be changed by the displacement. However only variations of εr and the area overlap will produce a linear response.

 


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