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Andreas Leber Beth Cholst Joseph Sandt Nicolas Vogel Mathias Kolle 《Advanced functional materials》2019,29(5)
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. 相似文献
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Jingjing Guo Bingqian Zhou Changxi Yang Qionghai Dai Lingjie Kong 《Advanced functional materials》2019,29(33)
Stretchable physical sensors that can detect and quantify human physiological signals such as temperature, are essential to the realization of healthcare devices for biomedical monitoring and human–machine interfaces. Despite recent achievements in stretchable electronic sensors using various conductive materials and structures, the design of stretchable sensors in optics remains a considerable challenge. Here, an optical strategy for the design of stretchable temperature sensors, which can maintain stable performance even under a strain deformation up to 80%, is reported. The optical temperature sensor is fabricated by the incorporation of thermal‐sensitive upconversion nanoparticles (UCNPs) in stretchable polymer‐based optical fibers (SPOFs). The SPOFs are made from stretchable elastomers and constructed in a step‐index core/cladding structure for effective light confinements. The UCNPs, incorporated in the SPOFs, provide thermal‐sensitive upconversion emissions at dual wavelengths for ratiometric temperature sensing by near‐infrared excitation, while the SPOFs endow the sensor with skin‐like mechanical compliance and excellent light‐guiding characteristics for laser delivery and emission collection. The broad applications of the proposed sensor in real‐time monitoring of the temperature and thermal activities of the human body, providing optical alternatives for wearable health monitoring, are demonstrated. 相似文献
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本文由长距离无再生光孤子通信的各种基本限制及考虑出发,提出了对光纤放大器及光纤的要求以及今后研究工作的方向。文中公式都采用了实用工程单位以利计算。 相似文献
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为保证通信光纤在使用寿命内有正常的工作状态和特性,光纤的长期可靠性是一个至关重要的问题。关于光纤的可靠性有三个方面:(1)长期的机械强度;(2)由辐照引起的衰减变化;(3)氢对光纤损耗的影响。本文着重讨论这些方面的关键问题并强调对目前应用于光通信中光纤特性的理解。 相似文献
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聚合物光纤损耗及光谱特性的测量分析 总被引:3,自引:2,他引:1
聚合物光纤(POFs)的参数直接反映了POFs的特性,为了更好地了解POFs的性能,探索POFs的测量方法,对POFs的传输损耗光潜特性进行了理论和实验研究。分析了POFs的传输损耗特性以及与波长的相关性,利用剪断法和光谱分析法对POFs的传输损耗和光谱特性进行测定,最后测得在550~670nm波长范围内聚甲基丙烯酸甲酯(PMMA)阶跃型POFs的传输损耗光谱特性。结果娃示,PMMA阶跃型POFs在510~580nm和650nm的波长范围内有较低的损耗。 相似文献
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通信光纤的最新研究动向 总被引:2,自引:0,他引:2
胡先志 《电信工程技术与标准化》2005,(2):55-59
本文介绍了宽带光传输非零色散位移光纤(G.656光纤)、塑料光纤和光子晶体等通信光纤的特性以及它们的最新研究动向. 相似文献
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用热聚合法制备了掺Eu(DBM)3Phen螯合物的聚合物光纤,建立了团簇化铕离子相互作用模型,以此为基础研究该掺杂聚合物光纤的团簇现象。利用速率方程理论,结合光纤的抽运光透射率实验,得到所研究光纤中团簇化铕离子浓度。掺铕质量分数为0.1%,0.2%,0.3%,0.4%,0.5%,1%的聚合物光纤中团簇化铕离子的浓度分别为0.045,0.07,0.07,0.07,0.07,0.08。因此,该掺杂聚合物光纤的团簇化铕离子浓度较低且基本不随掺杂浓度的增加而增加,铕离子之间的团簇化现象不明显。 相似文献
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液芯光纤近红外光谱特性研究 总被引:1,自引:0,他引:1
陈钰杰 《光纤与电缆及其应用技术》2005,(4):41-45
通过实验测试了液芯光纤的液芯溶液在1510~1590nm近红外波段的透光特性和不同液芯溶液的红外光谱曲线,分析了影响液芯光纤透射率的因素,为寻找可实际应用于光通信波段的液芯光纤材料提供了一些实验数据。 相似文献
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平行手征光纤之间的耦合系数 总被引:1,自引:0,他引:1
对放置于手征介质中的两根平行手征光纤之间的耦合系数进行了详细的数值计算和讨论,给出了耦合系数随手征参数、相对介电常数、归一化频率、光纤之间的距离等的变化关系曲线。 相似文献
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本文分析了非线性轴向不均匀单模光纤中的调制不稳定性,给出了不同情形下光纤调制总增长值,修正了Anderson关于最大调制增长值的结果,得出了维持调制增长的光纤长度,尽管存在光纤损耗,也可达到非常大的数值的结论。 相似文献
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介绍了一种带正色散的单模光纤,用来均衡常用于海底光缆中的非零色散位移光纤的负色散。这种光纤类似于常规单模光纤(G.652光纤),但具有较低的衰减和较小的宏弯损耗。由于这种光纤应用常规的掺锗纤芯和纯SiO2包层,与目前常用的纯SiO2纤芯和掺氟包层的色散均衡光纤相比,在成本上具有较大的优越性。 相似文献
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