Giansanti Daniele, Maccioni Giovanni, Macellari Velio
Dipartimento di Tecnologie e Salute, Istituto Superiore di Sanità, 00161 Roma, Italy.
IEEE Trans Biomed Eng. 2005 Jul;52(7):1271-7. doi: 10.1109/TBME.2005.847404.
In this paper, we propose a device for the Position and Orientation (P&O) reconstruction of human segmental locomotion tasks. It is based on three mono-axial accelerometers and three angular velocity sensors, geometrically arranged to form two orthogonal terns. The device was bench tested using step-by-step motor-based equipment. The characteristics of the six channels under bench test conditions were: crosstalk absent, non linearity < +/- 0.1% fs, hysteresis < 0.1% fs, accuracy 0.3% fs, overall resolution better than 0.04 deg/s, 2 x g x 10(-4). The device was validated with the stereophotogrammetric body motion analyzer during the execution of three different locomotion tasks: stand-to-sit, sit-to-stand, gait-initiation. Results obtained comparing the trajectories of the two methods showed that the errors were lower than 3 x 10(-2) m and 2 deg during a 4s of acquisition and lower than 6 x 10(-3) m and 0.2 deg during the effective duration of a locomotory task; showing that the wearable device hereby presented permits the 3-D reconstruction of the movement of the body segment to which it is affixed for time-limited clinical applications.
在本文中，我们提出了一种用于人体节段性运动任务的位置和方向（P&O）重建的设备。它基于三个单轴加速度计和三个角速度传感器，按几何方式排列以形成两个正交三元组。该设备使用基于步进电机的设备进行了台架测试。台架测试条件下六个通道的特性为：无串扰、非线性<±0.1%满量程、滞后<0.1%满量程、精度0.3%满量程、整体分辨率优于0.04°/s、2×g×10⁻⁴。在执行三种不同的运动任务（从站立到坐下、从坐到站立、步态起始）期间，使用立体摄影测量人体运动分析仪对该设备进行了验证。比较两种方法的轨迹所获得的结果表明，在4秒的采集过程中，误差低于3×10⁻²米和2°，在运动任务的有效持续时间内，误差低于6×10⁻³米和0.2°；这表明本文所展示的可穿戴设备能够对其附着的身体节段的运动进行三维重建，适用于有时间限制的临床应用。
