Hansson G A, Asterland P, Holmer N G, Skerfving S
Department of Occupational & Environmental Medicine, University Hospital, Lund, Sweden.
Med Biol Eng Comput. 2001 Jul;39(4):405-13. doi: 10.1007/BF02345361.
There is a need for objective and quantitative methods for measuring posture and movement, so that, for instance, exposure-response relationships for work-related musculoskeletal disorders can be established. Inclinometry data have been obtained from triaxial accelerometers based on uniaxial solid-state accelerometers used in conjunction with a computer program to perform co-ordinate transformations. The transducer can be mounted in an arbitrary orientation on a body segment, since if two reference positions are recorded, the co-ordinate system of the transducer can be transformed to that of the body segment. The angular error of the system is small (1.3 degrees), the reproducibility is high (0.2 degrees), and the inherent angular noise is small (0.04 degrees) and independent of the orientation of the device. Under quasi-static conditions, the angular velocities can be derived from the inclinometry data. The angular and the angular-velocity errors can be approximated using the relative deviation of the acceleration magnitude from gravitation. For applications involving a high degree of movement, the accelerometer data are still valid, although they cannot be interpreted as inclination. Used in combination with the computer program, the transducer can be used to measure posture and movement under static and quasi-static conditions, which occur in most areas of occupational work. It is shown that spherical co-ordinates can be used to present the inclinometry data.
需要有客观和定量的方法来测量姿势和运动，以便能够建立例如与工作相关的肌肉骨骼疾病的暴露-反应关系。倾斜度测量数据是通过基于单轴固态加速度计的三轴加速度计获得的，该单轴固态加速度计与一个计算机程序结合使用以进行坐标变换。该传感器可以以任意方向安装在身体节段上，因为如果记录两个参考位置，传感器的坐标系就可以转换为身体节段的坐标系。该系统的角度误差小（1.3度），再现性高（0.2度），固有角度噪声小（0.04度）且与设备的方向无关。在准静态条件下，角速度可以从倾斜度测量数据中推导出来。角度和角速度误差可以使用加速度大小相对于重力的相对偏差来近似。对于涉及高度运动的应用，加速度计数据仍然有效，尽管它们不能被解释为倾斜度。与计算机程序结合使用时，该传感器可用于测量静态和准静态条件下的姿势和运动，这些情况发生在大多数职业工作领域。结果表明，球坐标可用于呈现倾斜度测量数据。
