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首页> 外文期刊>IEEE sensors journal >Calibration of an AC Zero Potential Circuit for Two-Dimensional Impedimetric Sensor Matrices
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Calibration of an AC Zero Potential Circuit for Two-Dimensional Impedimetric Sensor Matrices

机译：用于二维阻碍传感器矩阵的AC零电位电路的校准

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摘要

The alternating current zero potential circuit (AC-ZPC) has been recently proposed for two-dimensional resistive sensor matrices, where each matrix row is driven by an AC signal at an individual frequency and every column is read separately. The AC-ZPC method enables the simultaneous measurement of all sensors in the matrix and is insensitive to DC offset voltages of amplifiers. This work aims to investigate the feasibility of the AC-ZPC method for matrices of impedimetric sensors and to propose a calibration approach for suppressing the measurement deviations caused by row interface impedances. The feasibility of the AC-ZPC measurement method for the impedimetric sensor matrices and the proposed calibration approach have been proved by both simulation and implementation results. Based on the commercial impedance measurement circuit AD5933, a prototype has been realized. It achieves a measurement deviation below 1% in the range from 1.9 k Omega vertical bar vertical bar 361.7 pF to 15.9 k Omega vertical bar vertical bar 102.0 pF.
机译：最近已经提出了交流零电电路（AC-ZPC）用于二维电阻传感器矩阵，其中每个矩阵行由单独频率的AC信号驱动，并且每列被单独读取。 AC-ZPC方法使得能够同时测量矩阵中的所有传感器，并且对放大器的直流偏移电压不敏感。这项工作旨在研究阻碍传感器矩阵的AC-ZPC方法的可行性，并提出校准方法来抑制由行界面阻抗引起的测量偏差。通过模拟和实现结果证明了用于阻碍传感器矩阵的AC-ZPC测量方法的可行性和所提出的校准方法。基于商业阻抗测量电路AD5933，已经实现了一种原型。它在1.9k Omega垂直条垂直条361.7pf至15.9k Omega垂直条垂直条102.0pf的范围内实现的测量偏差低于1％。

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