Estimation of Fingertip Contact Force by Plethysmography in Proximal Part of Finger
Estimation of Fingertip Contact Force by Plethysmography in Proximal Part of Finger
复制标题
通过手指近端体积描记法估计指尖接触力
DOI：
10.11239/jsmbe.55.115
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发表时间：
2017
影响因子：
--
通讯作者：
大城 理
中科院分区：
文献类型：
--
作者：
日夏 俊;吉元 俊輔;黒田 嘉宏;大城 理
由于手指接触力对物体操纵和身体运动的重要性，人们已经使用各种方法测量了手指接触力在生物力学和用户界面中的应用。然而，在以往的大多数方法中，由于传感装置的结构，用户的运动被限制在有限的空间内。本研究主要研究人体机械应力引起的血管变形引起的血流变化。此外，本报告提出了一种新的方法，利用在手指近端测量的光体积图(PPG)来估计指尖的接触力。该方法检测PPG信号中的非脉动和脉动分量，提取与接触力相关的特征值，并通过多元回归估计指尖接触力。在验证实验中，参与者在食指近端佩戴PPG探测器，并施加接触力。然后，研究了接触力与PPG特征值之间的关系。估计误差为被动触摸最大接触力的15%。此外，实验表明，无论手指角度如何，都可以估计主动触摸的接触力。
The contact force of a finger has been measured using various methods for applications in biomechanics and user interface, due to its importance for object manipulation and body motion. However, in most of the previous methods, the motion of the user is restricted in a limited space due to the sensing device structure. This research focused on the changes in blood flow due to deformation of blood vessels caused by mechanical stress on the body. Furthermore, this report proposes a novel method to estimate the contact force of a fingertip using a photoplethysmogram (PPG) measured at the proximal part of the finger. The proposed method detects non-pulsatile and pulsatile components of PPG signals, extracts feature values related to the contact force, and estimates the contact force at the fingertip by multiple regression. In the validation experiments, the participants wore a PPG detector at the proximal part of the index finger and applied a contact force. Then, the relationship between the contact force and PPG feature values was investigated. The estimated error was found to be 15% of the maximum contact force for passive touch. Furthermore, the experiment indicated that the contact force could be estimated for active touch regardless of the finger angle.