3. Experimental results
The presented study focusses on the influence of the described electrode design parameters on the change in
capacitance caused by an applied pressure. To evaluate fabrication tolerances, we characterize three individual
transducers of each type. Each transducer is connected to the experimental setup consisting of a precise pressure
source, the fluid line filled with pure water, a liquid stopper on the transducers second end and the readout
electronics as shown in figure 3 (a). The change in capacitance is extracted using the PCap02 capacitance-to-digital
converter evaluation board from ACAM. The pressure is increased in steps of 5 x10³ Pa up to 50 x 10³ Pa and vice
versa. The measurement loop is repeated five times to achieve a statistical relevance. The result of such a
measurement loop for transducer type V8 (dimensions shown in figure 4) are displayed in figure 3 (b). A data point
represents the mean value of three different transducers with the same geometry with their corresponding error bars.