Design and Evaluation of a Fiber-Optic Grip Force Sensor with Compliant 3D-Printable Structure for (f)MRI Applications

Figure 4

Permissible dimension range (white) depending on grip force and hinge thickness . The shaded areas represent the areas, where the working point of the fiber-optic sensor enters the nonlinear region due to a too large displacement or where the internal stress in the compliant structure increases beyond yield point. A lower hinge thickness results in a better signal-to-noise ratio (SNR), as the sensor output voltage range is increased due to larger displacements. The hinge thickness for the manufactured device (black circle) was chosen based on a maximal SNR for a desired force range of 800 N.