Quasi-static bend sensor using electro-active materials
View Patent ↗A quasi-static bend sensor is taught that comprises a layering of a plurality of ionic polymer metal composite (IPMC) sections with intervening dielectric sections in a vertical stack configuration. The IPMC sections are electrically connected in parallel. The surface of the stack is coated with high-purity synthetic isoparaffins for polymer hydration to increase step response consistency. Finally, the vertical stack configuration is electrically connected to an electric field measurement device and a linear quadratic regulator based controller for reducing settling time.
1. A bend sensor, comprising:
a plurality of ionic polymer metal composite sections each section having a top conductive surface and a bottom conductive surface, wherein all of the sections are of the same dimensions;
a plurality of dielectric sections made of a thin flexible light weight dielectric material, wherein all of the sections are of the same dimensions as the plurality of ionic polymer metal composite sections, wherein the plurality of ionic polymer metal composite sections are stacked vertically with a single dielectric section between each individual ionic polymer metal composite section, such that none of the top conductive surfaces of the plurality of ionic polymer metal composite sections is in electrical contact with any of the bottom conductive surface of the plurality of ionic polymer metal composite sections;
a first plurality of conducting wire leads that join at one end to a single wire, wherein a single conducting wire lead of each first plurality of conducting wire leads is joined to each of the top conductive surfaces of the plurality of ionic polymer metal composite sections thereby electrically connecting all of the top conductive surfaces of the plurality of ionic polymer metal composite sections together in parallel;
a second plurality of conducting wire leads that join at one end to a single wire, wherein a single conducting wire lead of each second plurality of conducting wire leads is joined to each of the bottom conductive surfaces of the plurality of ionic polymer metal composite sections thereby electrically connecting all of the bottom conductive surfaces of the plurality of ionic polymer metal composite sections together in parallel;
a coating of high-purity synthetic isoparaffin disposed over the surface of the stack of the plurality of ionic polymer metal composite and dielectric sections to maintain polymer hydration;
an electric field measurement device electrically joined to the plurality of ionic polymer metal composite sections through the first plurality of conducting wire leads and the second plurality of conducting wire leads; and
a linear quadratic regulator based controller joined to said electric field measurement device.
2. A method for fabricating a bend sensor comprising the steps of:
providing a plurality of ionic polymer metal composite sections each section having a top conductive surface and a bottom conductive surface, wherein all of the plurality of ionic polymer metal composite sections are of the same dimensions;
providing a plurality of dielectric sections made of a thin flexible light weight dielectric material, wherein all of the dielectric sections are of the same dimensions as the plurality of ionic polymer metal composite sections;
stacking the plurality of ionic polymer metal composite sections vertically with a single dielectric section between each individual ionic polymer metal composite section, such that none of the top conductive surfaces of the plurality of ionic polymer metal composite sections is in electrical contact with any of the bottom conductive surface of the plurality of ionic polymer metal composite sections;
connecting each of the top conductive surfaces of the plurality of ionic polymer metal composite sections together electrically in parallel;
connecting each of the bottom conductive surfaces of the plurality of ionic polymer metal composite sections together electrically in parallel;
disposing a coating of high-purity synthetic isoparaffin over the surface of the stack of the plurality of ionic polymer metal composite and dielectric sections to maintain polymer hydration;
connecting an electric field measurement device electrically to the plurality of ionic polymer metal composite sections through the first plurality of conducting wire leads and the second plurality of conducting wire leads; and
connecting a linear quadratic regulator based controller electrically to said electric field measurement device.
3. The method of claim 2 wherein connecting each of the top conductive surfaces of the plurality of ionic polymer metal composite sections together electrically in parallel comprises:
providing a first plurality of conducting wire leads; and
joining a single conducting wire lead from said first plurality of conducting wire leads to each of the top conductive surfaces of the plurality of ionic polymer metal composite sections.
4. The method of claim 2 wherein connecting each of the bottom conductive surfaces of the plurality of ionic polymer metal composite sections together electrically in parallel comprises:
providing a second plurality of conducting wire leads; and
joining a single conducting wire lead from said second plurality of conducting wire leads to each of the bottom conductive surfaces of the plurality of ionic polymer metal composite sections.