Capacitive displacement sensor 1

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Presentation transcript:

Capacitive displacement sensor 1

Capacitice displacement sensor 2

Capacitive displacement sensing 3

Electric dipoles 2 (3.10,3.11)

Near- and far field from dipole Far field (dipole field) depend on: Dipole moment (charge*separation) Distance from dipole (->amplitude) Angle with dipole (->direction) Near field depend on: Charge Exact location of charges Hyperphysics Alonso/Finn: Fundamental univeristy physics

Dipoles in an electric field Due to thermal agitation the alignment of the dipoles is proportional to the applied field!! http://hyperphysics.phy-astr.gsu.edu/hbase/electric/dielec.html Fraden p.47

Displaced charge Total dielectric constant

Capacitive level measurement

Humiditiy sensor

Occupancy

Monopolar capacitive probe

Driven shield proximity sensor

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