Abstract

Calculations and experimental results are presented of the voltage fluctuations across a pair of sensor electrodes on a planar resistor. A constant current is passed through another pair of driver electrodes. Three types of geometry are considered which are all invariant for rotations of 90°. Areas of low and high contribution to the voltage fluctuations are calculated assuming homogeneous conductivity fluctuations. The calculation method rests on the sensitivity theorem in electrical network theory. Calculations are in agreement with experimental results.

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