An Insole Plantar Pressure Measurement System Based on 3D Forces Piezoelectric Sensor

In this paper, an insole plantar pressure device based on 3-D forces piezoelectric sensor, integrated into a shoe, was developed for monitoring plantar pressure under real-life conditions. The device consisted of an insole with eight measure points composed of piezoelectric sensor, a wireless data transmission and embedded computer. The piezoelectric sensor with ceramic was embedded into the insole assembled by three different directions (3D) of X, Y and Z. The piezoelectric sensors mathematical model was built, and the layout of these sensors in insole was investigated. Based on the FFT algorithm, the eight measurement points data were collected and analyzed taken by frequency. The plantar changes of the left and right foot in 3D direction were measured, respectively. The results were displayed on the software interface, it showed that the insole system can be used to monitor plantar pressure during daily living and is expected to be useful in various clinical applications. Copyright © 2012 IFSA.