fig2

Figure 2. Electrical characteristics of strain sensor. (A) Electrical signals (∆R/R₀) of strain sensor at different longitudinal tensions. (B) Electrical signals (∆R/R₀) of strain sensor at different transverse tensions. (C, D) Electrical signals (∆R/R₀) of strain sensor at different frequencies under 12.5% strain and its detailed signals at 6 Hz. (E, F) Electrical signals (∆R/R₀) of strain sensor in a fatigue test for 150 cycles and its detailed signals from a selected range.