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ECT sensitivity distribution maps

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Hi,

I am using Comsol ver 3.5a Electrostatics module to design my 12 electrode electrical capacitance sensor in 2D. Now i would like to generate a sensitivity map for this ECT sensor but before that would like to transform my 2D model to 3D. So my first question is that how can i transform my 2D model to 3D?
Then after that, how 3D sensitivity distribution (map) could be obtained using COMSOL?
Sensitivity distribution is essentially a map of the sensor response to a short test probe of high permittivity material in a low permittivity background as it located at different x, y and z positions inside the sensor. In principle, the sensitivity distributions can be obtained by physical measurement or by FE analysis. The 3D sensitivity distribution of electrode pair ij,Sij(k) (the subscript i and subscript j indicate that the measurement electrode i and j are the excitation and the
detection electrodes.


Please help me.

Thanks.

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