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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Performance Analysis of a Lower Limb Multi Joint Angle Sensor Using CYTOP Fiber: Influence of Light Source Wavelength and Angular Velocity Compensation
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Performance Analysis of a Lower Limb Multi Joint Angle Sensor Using CYTOP Fiber: Influence of Light Source Wavelength and Angular Velocity Compensation

机译：使用CYTOP光纤的下肢多关节角度传感器的性能分析：光源波长和角速度补偿的影响

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摘要

This paper presents the analysis of an intensity variation polymer optical fiber (POF)-based angle sensor performance, i.e., sensitivity, hysteresis and determination coefficient ( ), using cyclic transparent optical polymer (CYTOP) fiber. The analysis consisted of two approaches: influence of different light source central wavelengths (430 nm, 530 nm, 660 nm, 870 nm and 950 nm) and influence of different angular velocities ( rad/s, rad/s, rad/s, rad/s and rad/s). The first approach aimed to select the source which resulted in the most suitable performance regarding highest sensitivity and linearity while maintaining lowest hysteresis, through the figure of merit. Thereafter, the analysis of different angular velocities was performed to evaluate the influence of velocity in the curvature sensor performance. Then, a discrete angular velocity compensation was proposed in order to reduce the root-mean-square error (RMSE) of responses for different angular velocities. Ten tests for each analysis were performed with angular range of to , based on knee and ankle angle range during the gait. The curvature sensor was applied in patterns simulating the knee and ankle during the gait. Results show repeatability and the best sensor performance for nm in the first analysis and show high errors for high angular velocities ( rad/s) in the second analysis, which presented up to angular error. The uncompensated RMSE was high for all velocities ( to ), whereas the compensated RMSE decreased up to ( to ). The compensated responses of application tests showed maximum error of and minimum of , presenting a decrease of mean angular error up to when compared with uncompensated responses.
机译：本文介绍了使用环状透明光学聚合物（CYTOP）光纤对基于强度变化聚合物光纤（POF）的角度传感器性能（即灵敏度，磁滞和确定系数（））的分析。分析包括两种方法：不同光源中心波长（430 nm，530 nm，660 nm，870 nm和950 nm）的影响和不同角速度（rad / s，rad / s，rad / s，rad的影响） / s和rad / s）。第一种方法旨在通过品质因数来选择在最高灵敏度和线性度的同时保持最低滞后性的最合适性能的光源。之后，对不同的角速度进行分析，以评估速度对曲率传感器性能的影响。然后，提出了离散角速度补偿，以减少不同角速度响应的均方根误差（RMSE）。根据步态期间膝盖和踝关节的角度范围，对的角度范围为到，对每个分析进行了十次测试。将曲率传感器应用于模拟步态期间膝盖和脚踝的模式。结果显示，在第一个分析中，nm的可重复性和最佳传感器性能；在第二个分析中，对于高角速度（rad / s），显示出高误差，最高可显示出角度误差。所有速度（to）的未补偿RMSE都很高，而直到（to），补偿后的RMSE降低。应用测试的补偿响应显示最大误差为，最小误差为，与未补偿响应相比，平均角误差减小了。

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