What is the simplest capacitance measurement protocol?
Most work to-date with circular vessels has used the simplest arrangement (which we refer to as protocol 1) where capacitances are measured between single pairs of electrodes. The measurement sequence for protocol 1 involves applying an alternating voltage from a low-impedance supply to one (source) electrode. The remaining (detector) electrodes are all held at zero (virtual ground) potential and the currents which flow into these detector electrodes (and which are proportional to the inter-electrode capacitances) are measured. A second electrode is then selected as the source electrode and the sequence is repeated until all possible electrode pair capacitances have been measured. This generates M independent inter-electrode capacitance measurements, where: M = E.(E – 1)/2 and E is the number of electrodes located around the circumference. For example for E = 12, M = 66. Back to top.
