Coping with electrode polarization for development of DC-Driven electrical impedance tomography
| Autor: | Yasuteru Sibamoto, Jun Sagawa, Yoshiyasu Hirose, Yutaka Kukita |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Millisecond
Materials science business.industry Direct current Phase (waves) Current source Computer Science Applications Coping (joinery) Modeling and Simulation Electrode Optoelectronics Electrical and Electronic Engineering Polarization (electrochemistry) business Instrumentation Electrical impedance tomography |
| Zdroj: | Flow Measurement and Instrumentation. 81:102006 |
| ISSN: | 0955-5986 |
| DOI: | 10.1016/j.flowmeasinst.2021.102006 |
| Popis: | An electrical impedance tomography (EIT) system design is proposed for imaging of phase distribution in gas-water two-phase flow from boundary measurement of electrical potentials in response to direct current (DC) injection. DC injection simplifies substantially the system design, but introduces problems due to polarization of injection electrodes. Electrode polarization means charge accumulation on the electrode-water interface causing a drift in the interfacial potential difference. The polarization problems are coped with by using dedicated electrodes for injection and potential measurement, and using a current source unaffected by the polarization of current-carrying electrodes (CCEs). Furthermore, the polarization of CCEs is controlled, to lessen the possible influence on the sensing electrodes (SEs), by using a short (milliseconds in width) pulse for injection with a charge balanced injection strategy. The impact of electrode polarization and the effectiveness of countermeasures introduced in the present design are discussed through comparisons of measured boundary potentials and of images reconstructed for a simple object simulating large bubbles in water. |
| Databáze: | OpenAIRE |
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