Research / 2020 / Article / Fig 3

Research Article

Highly Selective Biomimetic Flexible Tactile Sensor for Neuroprosthetics

Figure 3

Response ability of the flexible shear force sensors and its corresponding mechanism. (a) Normal force: (i) experimental setup. (ii) The response curve for an 11.2 N (199.1 kPa) normal force. The capacitance was kept basically constant. (iii) The different height-width ratio responses of the sensor to the 0-20 N (0-355 kPa) normal force. (iv) Finite element analysis (FEA) showing that the structure remains stable under 14 kPa of pressure. (A) The deformation of the film containing electrodes and dielectric. (B) The deformation of electrodes specifically. (b) Sliding friction force: (i) experimental setup, in which the force gauge moves parallel to the sensor. (ii) The response curve for a 3.8 N (67.6 kPa) sliding friction force. The capacitance decreased initially and returned to its original value when the force gauge left the sensor. (iii) The different height-width ratio responses of the sensor to the 0-10 N (0-178 kPa) sliding friction force. The capacitance variations follow the fitting formula . (iv) Finite element analysis showing that the electrodes were laterally bent when a 7 kPa sliding friction force and 14 kPa pressure were applied. (A) The deformation of the film containing electrodes and dielectric. (B) The deformation of electrodes specifically. (c) Static friction force: (i) experimental setup, in which the force gauge moves vertically and the sensor is fixed on the oblique plane of 45°. (ii) The response curve for an 11.2 N (199.1 kPa) static friction force. The capacitance increased immediately. (iii) The different height-width ratio responses of the sensor to the 0-20 N (0-355 kPa) static friction force. The capacitance variations follow the fitting formula . (iv) Finite element analysis (FEA) showing that the electrodes were laterally stretched when a 14 kPa static friction force and 14 kPa pressure were applied. (A) The deformation of the film containing electrodes and dielectric. (B) The deformation of electrodes specifically.
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