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Figure 2 | BioMedical Engineering OnLine

Figure 2

From: Investigating the possible effect of electrode support structure on motion artifact in wearable bioelectric signal monitoring

Figure 2

The electrode setup and the sensitivity field of the three electrode impedance measurement setup. a The electrode setup. Textile electrodes are shown as a gray centerpiece with yellow outline, and the medical electrodes are shown as a blue centerpiece with gray outline. Please note that for experiments with Electrode M, explained below, the textile electrode locations are occupied by medical electrodes. b The sensitivity field of the three electrode impedance measurement setup. Due to reciprocity, these two fields can be used interchangeably for voltage and current, and the sensitivity field is defined as the area covered by both fields [20]. The presented figure is different than the sensitivity distribution of the impedance measurement. The sensitivity distribution is the dot product of the current density fields of the current feeding electrodes and voltage measurement electrodes. The dot product of these vector fields is a scalar and is maximum when the fields are parallel, zero when the fields are perpendicular, and negative when the angle between the fields is larger than 90° [21, 22]. In the presented figure, the areas impacting the measurement are the intersection areas of the two fields.

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