Trial of motion analysis using 3 axis angular velocity sensors

Abstract

We built an angular velocity measurement system which can be applied to clinical motion analysis using 3 axis angular velocity sensors. Although it connects three sensors simultaneously, it is a compact system, and it is able to measure angular velocity without restraint of motion. We equipped three places, a subject's thigh, lower thigh, and foot, with the sensors, and derived the angular velocity generated at the leg joints at the time of a walking. The result reflected the motion of the 3-dimensional space of each joint. The data of 1 walk cycle was picked out from the measurement data. It had captured the motion of the double knee action, foot inversion, foot adduction, and more. It is also possible to output analog data to an Excel file, thereby allowing detaild numerical analysis. Moreover, calculation of movement angle and angle acceleration is also possible from the measured angular velocity, giring flexibility to analysis methods. We now need to establish effective tools for the analysis of the measurement data.