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Kapasitive måleprinsipper

Rene geometriske målinger som kan forstås fra elektrostatikk (gauss lov) Materialavhengige målinger kan forståes ut fra dielektrisitetskonstant og forskyvnings strøm i tillegg til elektrostatikk. Materiale fra Fraden kap 3.1 og 3.2 Hyperphysics Fraden kap 7 og 8. Kapasitive måleprinsipper.

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Kapasitive måleprinsipper

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  1. Rene geometriske målinger som kan forstås fra elektrostatikk (gauss lov) Materialavhengige målinger kan forståes ut fra dielektrisitetskonstant og forskyvnings strøm i tillegg til elektrostatikk Materiale fra Fraden kap 3.1 og 3.2 Hyperphysics Fraden kap 7 og 8 Kapasitive måleprinsipper

  2. Capacitive displacement sensor 1

  3. Capacitice displacement sensor 2

  4. Capacitive displacement sensing 3

  5. Capacitive spring based accelerometer

  6. Capacitive finger accelerometer

  7. Electric dipoles 2 (3.10,3.11)

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

  9. 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

  10. Total dielectric constant Displaced charge

  11. Capacitive level measurement

  12. Humiditiy sensor

  13. Occupancy

  14. Monopolar capacitive probe

  15. Driven shield proximity sensor

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