文章基本信息

标题：Electrode Configuration with Howland Current Source and Demodulator for Electrical Impedance Tomography
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作者：Hossein Nasiri ; Rafael Benetti ; Rogério Y. Takimoto 等
期刊名称：IFAC PapersOnLine
印刷版ISSN：2405-8963
出版年度：2021
卷号：54
期号：15
页码：79-84
DOI：10.1016/j.ifacol.2021.10.235
语种：English
出版社：Elsevier
摘要：AbstractElectrical Impedance Tomography (EIT) uses boundary voltage measurements due to multiple injection current patterns to reconstruct cross-sectional impedance images. Usually, the hardware does not provide any capacitive information and the reconstructed image is only based on conductivity. An approach where each electrode has its own Howland current source is a powerful and innovative architecture in which different current injections can be implemented. However, the potential source of error increases with this new architecture when compared with conventional architectures. This paper enumerates some of the potential errors considering the main modules of the electrode: 1. Howland current source; 2. ADC and DAC converters; and 3. The demodulator. A methodology for verifying ADC and DAC precision and linearity is proposed.
关键词：Keywordssignal processingelectrical impedance tomographydemodulator