The paper presents a novel sensorized skin insole based on tactile capacitive technology. The insole prototype provides information such as pressure distribution, contact force and moments, center of pressure. These variables require an accurate calibration procedure to retrieve the relationship between the measured capacitance and the corresponding applied pressure. A calibration technique is here proposed and validated by exploiting a pair of shoes equipped with force/torque sensors. The validation analysis shows that the quantities estimated by the skin insoles match data measured by the force/torque sensors. Further, an example of real application for using skin insoles is presented for a gait analysis.
Keywords sensorized insole, capacitive sensors, tactile sensors array, wearable sensorsSeveral techniques and technologies to detect gait events and plantar pressure monitoring have been developed over the years. The solutions involve mainly the following sensors: force platforms, pedobarographs, force treadmill, sensorized shoes and sensorized insoles. Force platforms [1,10,22], pedobarographs and force treadmill [19] are very reliable and accurate and can stream information at very high frequencies. They can be used for both static and dynamic studies arXiv:1910.06370v1 [physics.app-ph]
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