We examined eight different electrode designs (V1 to V8, shown in fig. 4). Transducer type V8 revealed to be the
most sensitive geometry with a sensitivity of 0.195 fF/103
Pa including the hysteresis and a CV of 6.4% considering
all three fabricated transducers. Thereby, eccentricity of the tube to the electrodes implies highest influence.
The electrode shapes V1 to V3 are differentiated by the diameter of the half-shell arrangement, where V1
features the smallest diameter and V3 the largest diameter. According to figure 4, an increased inner diameter d will
reduce the sensitivity (from 0.171 fF/103
Pa down to 0.104 fF/103
Pa) due to the bigger average distance. Thereby,
the associated increase of the electrode area which reduces this negative effect can be neglected.