Leuenberger Kaspar, Gassert Roger
Rehabilitation Engineering Lab, ETH Zurich, Switzerland.
Annu Int Conf IEEE Eng Med Biol Soc. 2011;2011:2237-41. doi: 10.1109/IEMBS.2011.6090424.
Wearable sensor modules are a promising approach to collecting data on functional motor activities, both for repeated and long-term assessments, as well as to investigate the transfer of therapy to activities of daily living at home, but have so far either had limited sensing capabilities, or were not laid out for long-term monitoring. This paper presents ReSense, a miniature sensor unit optimized for long-term monitoring of functional activity. Inertial MEMS sensors capture accelerations along six degrees of freedom and a barometric pressure sensor serves as a precise altimeter. Data is written to an integrated memory card. The realized module measures Ø25 × 10 mm, weighs 10 g and can record continuously for 27 h at 25 Hz and over 22 h at 100 Hz. The integrated power-management system detects inactivity and extends the operating time by about a factor of two, as shown by initial 24 h recordings on five energetic healthy adults. The integrated barometric pressure sensor allowed to identify activities incorporating a change in altitude, such as going up/down stairs or riding an elevator. By taking into account data from the inertial sensors during the altitude changes, it becomes possible to distinguish between these two activities.
可穿戴传感器模块是一种很有前景的方法，可用于收集功能性运动活动的数据，既适用于重复和长期评估，也可用于研究治疗在家中日常生活活动中的转移情况，但到目前为止，它们要么传感能力有限，要么未设计用于长期监测。本文介绍了ReSense，一种针对功能性活动长期监测进行优化的微型传感器单元。惯性MEMS传感器可沿六个自由度捕获加速度，气压传感器用作精确的高度计。数据写入集成存储卡。所实现的模块尺寸为Ø25×10毫米，重10克，在25赫兹时可连续记录27小时，在100赫兹时可连续记录超过22小时。集成的电源管理系统可检测不活动状态，并将运行时间延长约一倍，这在对五名精力充沛的健康成年人进行的初始24小时记录中得到了体现。集成的气压传感器能够识别包含海拔变化的活动，例如下楼梯/上楼梯或乘坐电梯。通过在海拔变化期间考虑来自惯性传感器的数据，就有可能区分这两种活动。
