Fig. 3: Well-defined signals of strain sensing and touch positioning sensing.
From: A hyperconformal dual-modal metaskin for well-defined and high-precision contextual interactions
a Photograph of the HDM. metaskin conformally attached to the fingers, including a parallel conductive pathway and a touch trigger. Insets show microscopic mechanisms of strain sensing and touch localization functions. (Rfinger, Relectrode and Rcontact correspond to the finger electrode resistance, sensor electrode resistance, and contact resistance, respectively.) b Equivalent circuit for exteroceptive and proprioceptive sensing modes. (R and R’ represent. the equivalent resistances. λ represents the stretching coefficient.) c Linear resistance changes as touch positions on the meta-skin are progressively varied. Touch resistance directly reflects the touch position, with resistance changes always being negative. d Consistent signal output during repeated touches at same locations. e Stretch response curve across a range of 0% to 50% strain. The segment gauge factors GF1, GF2, and GF3 were 32.45, 64.28, and 132.77, respectively. f Comparative stretch responses at 5% strain. were evaluated for sensors fabricated with Ag NP, Ag NP/CNT, and Ag NP/Ag NW pastes. The Ag NP/Ag. NW nanocomposite sensor demonstrated the most stable performance under cyclic loading conditions. g Voltage divider circuit diagram and corresponding signal patterns, demonstrating the conversion process. from resistance to voltage. (Rsensor and Rref represent the sensor resistance and the reference resistance, respectively.) h, i Decoupling calculation of touch positions under stretching conditions, comparing. measured results to theoretical values for validation. (P1, P2 and P3 means three different touch positions).
