Abstract
In this paper, we propose a smart insole for inexpensive plantar pressure sensing and a simple visualizing scheme. The insole is composed of two elastomeric layers and two electrode layers where the common top electrode is submerged in the insole. The upper elastomeric layer is non-conductive poly-dimethyl-siloxane (PDMS) and supports plantar pressure buffering and the lower layer is carbon nano-tube (CNT)-dispersed PDMS for pressure sensing through piezo-resistivity. Under the lower sensing layer are 16 bottom electrodes for pressure distribution sensing without cell-to-cell interference. Since no soldering or sewing is needed the smart insole manufacturing processes is simple and cost-effective. The pressure sensitivity and time response of the material was measured and based on the 16 sensing data of the smart insole, we virtually extended the frame size for continuous and smoothed pressure distribution image with the help of a simple pseudo interpolation scheme.
Highlights
Wearable device technologies have become widely researched and some of them have already appeared in the consumer market
Since the human gait pattern may reveal potential sickness and intrinsic healthcare-related habits, expensive and burdened gait pattern measurement and analyses have been performed in the professional Gait Laboratory
carbon nano-tube (CNT)-dispersed attached on the flat PDMS surface for the top electrode formation and 0.45 wt% CNT‐dispersed is poured on the top electrode to form the lower piezoresistive insole layer
Summary
Wearable device technologies have become widely researched and some of them have already appeared in the consumer market. Samsung’s smart insole is a wearable Internet of Things (IoT) device that measures various activities such as activity amount and walking method, transmits data with a smartphone etc. Facilities and processes to make the insole a sensor. A arib‐shaped conductive textile is attached on the flat surface for the top electrode formation and. CNT-dispersed attached on the flat PDMS surface for the top electrode formation and 0.45 wt% CNT‐dispersed is poured on the top electrode to form the lower piezoresistive insole layer. 16 made electrodes are madeflexible on a separate flexible substrate and stacked up on the hardened insole. Figure shows the processing equipment and sequential on hardened insole. TheFigure processing equipment and sequential insole shape. 4 shows the processing equipment and sequential insole shape. Layer with mixer (PCM) blending machine, (c) insole mold, (d) upper poly‐dimethyl‐siloxane poly-dimethyl-siloxane (PDMS) layer with final insole side view.
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