D8.3 Accuracy Improvement of the Alternating Current Zero Potential Method for Impedimetric Sensor Matrices
- SMSI 2021
2021-05-03 - 2021-05-06
- SMSI 2021 - Measurement Science
- D8 Applications I
- Z. Hu, D. Chen, O. Kanoun - Technische Universität Chemnitz, Chemnitz (Germany)
- 279 - 280
In , we introduced the alternating current zero potential circuit (AC-ZPC) for two-dimensional resistive sensor matrices, where each matrix row is driven by an individual AC signal at a certain frequency, so that every column can be read separately. This method enables the simultaneous measurement of all sensors in the matrix and dispenses with multiplexers. In this work, a novel calibration method for the AC-ZPC for two-dimensional sensor matrices is proposed, where the measurement deviation caused by the used operational amplifiers has been eliminated. A measurement accuracy improvement has been thereby realized. This novel calibration strategy has been carried out by simulation for matrices of impedimetric sensors composed of one resistor in parallel to one capacitor. The achieved measurement accuracy regarding the capacitors is in the pico-farad range and is for the parallel resistors in the kilo-Ohm range.