Abstract
Electrodes are basic components of C4D (capacitively coupled contactless conductivity detection) sensors, and different electrode structures (the configuration pattern or the electrode geometry) can lead to different measurement results. In this work, the effects of electrode geometry of radial configuration on the measurement performance of C4D sensors are investigated. Two geometrical parameters, the electrode length and the electrode angle, are considered. A FEM (finite element method) model based on the C4D method is developed. With the FEM model, corresponding simulation results of conductivity measurement with different electrode geometry are obtained. Meanwhile, practical experiments of conductivity measurement are also conducted. According to the simulation results and experimental results, the optimal electrode geometry of the C4D sensor with radial configuration is discussed and proposed. The recommended electrode length is 5–10 times of the pipe inner diameter and the recommended electrode angle is 120–160°.
Highlights
Electrodes are basic components of conductivity detection (C4 D) sensors, and different electrode structures can lead to different measurement results
A C4 D sensor consists of an AC source, an excitation electrode, a pick-up electrode, an insulating pipe and a signal process unit
The excitation electrode and pick-up electrode, which are connected with the excitation source and the signal process unit respectively, are attached to the outer wall of the pipe
Summary
Electrodes are basic components of C4 D (capacitively coupled contactless conductivity detection) sensors, and different electrode structures (the configuration pattern or the electrode geometry) can lead to different measurement results. The effects of electrode geometry of radial configuration on the measurement performance of C4 D sensors are investigated. Compared with traditional contact conductivity detection methods, the electrodes of the C4 D sensor are not in direct contact with the measured fluid. A C4 D sensor consists of an AC source, an excitation electrode, a pick-up electrode, an insulating pipe and a signal process unit. The tubular configuration is the most commonly used electrode structure of C4 D sensor For this configuration, the fluid is measured in the axial direction of the pipeline. Through decades of sustained development, C4 D sensors have been studied by many researchers and are mostly employed for detection in capillary
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