Estimating Ground Inclination Using Strain Sensors with Fourier Series Representation

Figure 1

(a) Strain measurement setup. One strain gauge sensor $S^1\mathrm{\hspace{0.17em}\hspace{0.17em}}$ is attached partly on the inside at the back and one $S^2\mathrm{\hspace{0.17em}\hspace{0.17em}}$ partly on the inside at the front. Sensors $S^3$ and $S^4$ are attached at the corresponding positions but on the outside. (b) Measured ankle angle $\alpha$ (stars) and force F (squares) relation to AFO strain sensor output. Estimated linear relations: solid ($\alpha$) and dashed (F).

(a)

(b)