Optimization Of Multi-ring Sensing Electrode Set
Monica Kaufer, Leonard Rasquinha, P. P. Tarjan · 2005
The potential generated in a set of concentric ring electrodes by a moving dipole layer has been simulated by a linear finite element model. The wavefront was represented by rectangular charged elements with the charge concentrated at the center of each element. The results were described in a previous paper. The model was refined to reflect the solid angle described by the corners of the finite element and the center of the element on the ring of interest. This corrected the potential while the dipole layer was near the center of the sensing electrodes. The model confirmed that the far-field dependence of both bipolar and tripolar rings was a function of r-4. As expected, the tripolar configuration is more spatially sensitive with a smaller amplitude. When signal amplitude is more important than spatial specificity then the bipolar configuration appears superior.