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Stretchable Thermoplastic Elastomer Optical Fibers for Sensing of Extreme Deformations

机译：可感测极端变形的可拉伸热塑性弹性体光纤

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摘要

The design of advanced materials with coupled optical and mechanical properties is an important challenge in materials science; especially, the implementation of soft materials in optics has recently gained significant interest. Soft optical systems are particularly versatile in sensing, where large and repeated deformations require dynamically responsive materials. Here, stretchable step-index optical fibers, which are capable of reversibly sustaining strains of up to 300% while guiding light, are demonstrated. A continuous and scalable melt-flow process is used to coextrude two thermoplastic elastomers, thereby forming the fibers' high index core-low index cladding structure. Deformation of the fibers through stretching, bending, and indentation induces detectable, predictable, reversible, and wavelength-dependent changes in light transmission. Quantitative knowledge about the coupling of the fibers' mechanical and optical properties forms the basis for the design of fiber-based sensors that are capable of reliably assessing extreme mechanical stimuli. The fibers utility in sensing scenarios is demonstrated in a knee brace for continuous knee motion tracking, a glove for control of a virtual hand model, and a tennis racket capable of locating ball impacts. Such devices can greatly improve quantitative assessment of human motion in rehabilitation, sports, and anywhere else where large deformations need to be monitored reliably.
机译：具有光学和机械特性的先进材料设计是材料科学中的重要挑战。尤其是，近来在光学中使用软材料引起了人们的极大兴趣。软光学系统特别适用于传感，其中大而反复的变形需要动态响应的材料。在此，展示了在引导光的同时可逆地维持高达300％的应变的可拉伸阶跃折射率光纤。使用连续且可扩展的熔体流动工艺共挤出两种热塑性弹性体，从而形成纤维的高折射率纤芯低折射率包层结构。纤维通过拉伸，弯曲和压痕变形会引起可检测，可预测，可逆和波长相关的光传输变化。关于纤维的机械和光学特性耦合的定量知识构成了基于纤维的传感器设计的基础，该传感器能够可靠地评估极端的机械刺激。用于感知场景的纤维用途在用于连续膝盖运动跟踪的护膝，用于控制虚拟手模型的手套以及能够定位球撞击的网球拍中得到了证明。这种设备可以极大地改善人体在康复，运动以及其他需要可靠监测大变形的地方的运动的定量评估。

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