Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.
J Acoust Soc Am. 2012 Sep;132(3):1384-91. doi: 10.1121/1.4740473.
A continuous scanning laser Doppler velocimetry (CSLDV) technique is used to measure the low frequency broadband vibrations associated with human skeletal muscle vibrations (typically f < 100 Hz) by continuously varying the orientation of laser beam over distances that are short compared to the characteristic wavelengths of the vibrations. The high frequency scan (compared to the vibration frequency) enables the detection of broadband translational and angular velocities at a single point using amplitude demodulation of the CSDLV signal. For instance, linear scans allow measurement of the normal surface velocity and one component of angular velocity vector, while circular scans allow measurement of an additional angular velocity component. This CSLDV technique is first validated here using gel samples mimicking soft tissues and then applied to measure multiple degrees of freedom (DOF) of a subject's hand exhibiting fatigue-induced tremor. Hence this CSLDV technique potentially provides a means for measuring multiple DOF of small human body parts (e.g., fingers, tendons, small muscles) for various applications (e.g., haptic technology, remote surgery) when the use of skin-mounted sensors (e.g. accelerometers) can be problematic due to mass-loading artifacts or tethering issues.
连续扫描激光多普勒速度计 (CSLDV) 技术用于通过连续改变激光束的方向来测量与人体骨骼肌振动相关的低频宽带振动（通常 f < 100 Hz），其方向变化的距离与振动的特征波长相比很短。与振动频率相比，高频扫描能够通过对 CSDLV 信号进行幅度解调，在单点检测宽带平移和角速度。例如，线性扫描允许测量法向表面速度和角速度矢量的一个分量，而圆形扫描允许测量额外的角速度分量。本研究首先使用模拟软组织的凝胶样本对该 CSLDV 技术进行验证，然后将其应用于测量因疲劳引起震颤而出现运动障碍的受试者手部的多个自由度 (DOF)。因此，当由于质量加载伪影或系绳问题而使用皮肤贴附式传感器（例如加速度计）变得复杂时，这种 CSLDV 技术为测量各种应用（例如触觉技术、远程手术）中小人体部位（例如手指、肌腱、小肌肉）的多个 DOF 提供了一种手段。
