Figure 3

Photographs and concept models of the electrodes and the proposed physical effect of electrode structure on the skin layers. Electrode A comprises a textile electrode supported by 40 mm diameter padding. Electrode B has an 8 mm wide, 2 mm deep ridge carved out of the 40 mm diameter support padding starting at the edges of the electrode and finishing 2 mm before the outer edges of the padding. A 2 mm thick, 1 mm high silicon ring has been placed on the outer edge. Electrode C has the textile electrode supported by padding the same diameter as the electrode. Electrode D has the textile electrode attached directly to the hard plastic of the electrode to the servo connector part. In the concept model drawings of the second row, the top grey circle is the textile electrode surface, yellow is the soft padding, and the bottom dark grey cylinder is the plastic connector part to the servo. In Electrode B, the grey ring is the outer silicon ring mentioned above. In the third and fourth rows, the proposed physical effect of the electrode structure on the epidermis and the dermis is presented. The epidermis is depicted in orange and the dermis is depicted in pink. The center blue line in the dermis is to provide an easier comparison between the drawings. The black dots under Electrode B are the cross-sectional view of the epidermis-constricting ring at the outer boundary, as shown in. We expect this narrow ring to dig into the epidermis. The larger electrode, because of the larger amount of epidermis displaced, might force the lower levels of the skin to also displace resulting in the epidermis being displaced less and thus causing a smaller motion artifact.