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Polymer optical fiber strain gauge for human-robot interaction forces assessment on an active knee orthosis

机译：用于主动膝关节矫形器中人机交互力评估的聚合物光纤应变仪

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摘要

This paper presents the development of a polymer optical fiber (POF) strain gauge based on the light coupling principle, which the power attenuation is created by the misalignment between two POFs. The misalignment, in this case, is proportional to the strain on the structure that the fibers are attached. This principle has the advantages of low cost, ease of implementation, temperature insensitiveness, electromagnetic fields immunity and simplicity on the sensor interrogation and signal processing. Such advantages make the proposed solution an interesting alternative to the electronic strain gauges. For this reason, an analytical model for the POF strain gauge is proposed and validated. Furthermore, the proposed POF sensor is applied on an active orthosis for knee rehabilitation exercises through flexion/extension cycles. The controller of the orthosis provides 10 different levels of robotic assistance on the flexion/extension movement. The POF strain gauge is tested at each one of these levels. Results show good correlation between the optical and electronic strain gauges with root mean squared deviation (RMSD) of 1.87 Nm when all cycles are analyzed, which represents a deviation of less than 8%. For the application, the proposed sensor presented higher stability than the electronic one, which can provide advantages on the rehabilitation exercises and on the inner controller of the device.
机译：本文介绍了一种基于光耦合原理的聚合物光纤（POF）应变仪的开发，该功率衰减是由两个POF之间的未对准引起的。在这种情况下，未对准与附着纤维的结构上的应变成比例。该原理具有成本低，易于实现，温度不敏感，电磁场抗扰性以及传感器询问和信号处理简单的优点。这些优点使提出的解决方案成为电子应变仪的有趣替代方案。因此，提出并验证了POF应变仪的分析模型。此外，提出的POF传感器通过屈曲/伸展循环应用于活动性矫形器中，以进行膝盖康复锻炼。矫形器的控制器在屈伸运动中提供10种不同级别的机器人辅助。 POF应变仪在上述每个级别上进行测试。结果表明，在分析所有循环后，光学应变仪和电子应变仪之间的均方根偏差（RMSD）为1.87 Nm，具有良好的相关性，这表明偏差小于8％。对于该应用，所提出的传感器具有比电子传感器更高的稳定性，这可以为康复训练和设备的内部控制器提供优势。

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  • 来源
    《Optical fiber technology》 |2018年第3期|205-211|共7页
  • 作者

    Leal-Junior Arnaldo G.; Frizera Anselmo; Marques Carlos; Sanchez Manuel R. A.; Botelho Thomaz R.; Segatto Marcelo V.; Pontes Maria Jose;

  • 作者单位

    Univ Fed Espirito Santo, Elect Engn Dept, Telecommun Lab LABTEL, Fernando Ferrari Ave, BR-29075910 Vitoria, ES, Spain;

    Univ Fed Espirito Santo, Elect Engn Dept, Telecommun Lab LABTEL, Fernando Ferrari Ave, BR-29075910 Vitoria, ES, Spain;

    Univ Aveiro, Inst Telecomunicacoes, Campus Univ Santiago, P-3810193 Aveiro, Portugal;

    Univ Fed Espirito Santo, Elect Engn Dept, Telecommun Lab LABTEL, Fernando Ferrari Ave, BR-29075910 Vitoria, ES, Spain;

    Univ Fed Espirito Santo, Elect Engn Dept, Telecommun Lab LABTEL, Fernando Ferrari Ave, BR-29075910 Vitoria, ES, Spain;

    Univ Fed Espirito Santo, Elect Engn Dept, Telecommun Lab LABTEL, Fernando Ferrari Ave, BR-29075910 Vitoria, ES, Spain;

    Univ Fed Espirito Santo, Elect Engn Dept, Telecommun Lab LABTEL, Fernando Ferrari Ave, BR-29075910 Vitoria, ES, Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fiber optic sensors; Polymer optical fiber; Strain gauges; Robotic rehabilitation;

    机译：光纤传感器;聚合物光纤;应变仪;机器人修复;

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