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Electrode Configuration with Howland Current Source and Demodulator for Electrical Impedance Tomography

机译:电极配置哈兰电流源和用于电气阻抗断层扫描的解调器

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Electrical 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.
机译:电阻抗断层扫描(EIT)由于多个喷射电流模式而使用边界电压测量来重建横截面阻抗图像。 通常,硬件不提供任何电容信息,并且重建的图像仅基于电导率。 一种方法,其中每个电极具有自己的榴弹兰州电流源是一种强大而创新的架构,可以实现不同的电流喷射。 然而,与传统架构相比,潜在的误差来源随着这种新架构而增加。 本文枚举了考虑电极主模块的一些潜在误差:1。榴域电流源; 2. ADC和DAC转换器; 和3.解调器。 提出了一种验证ADC和DAC精度和线性度的方法。

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