Fig. 2.
Force/torque measurement mechanism: (a) structure diagram; (b) force analysis diagram; (c) sensing unit; (d) the relationship between the measured displacement and output of the photo reflector; (e) directional deformation (along the force direction) of the sensing unit with force applied; (f) the relationship between the applied force and directional deformation of the sensing unit; (g) safety factor for the sensing unit with force applied; (h) minimum and average safety factors when various forces applied.