capacitive displacement sensor 1 - forsiden...near- and far field from dipole alonso/finn:...
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Capacitive displacement sensor 1
Capacitice displacement sensor 2
d
AC r
0
Capacitive displacement sensing 3
Cj
i
C
dti
C
QV
Electric dipoles 2 (3.10,3.11)
Ep
Near- and far field from dipole
Alonso/Finn: Fundamental univeristy physics Hyperphysics
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
Dipoles in an electric field
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/dielec.html
Fraden p.47
Due to thermal agitation the alignment of the dipoles is proportional
to the applied field!!
Displaced charge
S r
qSdE
0
rk Total dielectric constant
Capacitive level measurement
Humiditiy sensor
Monopolar capacitive probe
Driven shield proximity sensor
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