Fiber Fabry-Perot Interferometer for Curvature Sensing

A curvature sensor based on an Fabry-Perot （FP） interferometer was proposed. A capillary silica tube was fusion spliced between two single mode fibers, producing an FP cavity. Two FP sensors with different cavity lengths were developed and subjected to curvature and temperature. The FP sensor with longer cavity showed three distinct operating regions for the curvature measurement. Namely, a linear response was shown for an intermediate curvature radius range, presenting a maximum sensitivity of 68.52 pm/m-1. When subjected to temperature, the sensing head produced a similar response for different curvature radii, with a sensitivity varying from 0.84 pm/℃ to 0.89 pm/℃, which resulted in a small cross-sensitivity to temperature when the FP sensor was subjected to curvature. The FP cavity with shorter length presented low sensitivity to curvature.

Nanoscopic Tip Sensors Fabricated by Gas Phase Etching of Optical Glass Fibers

基于硅石的纤维尖端被使用在许多分光镜，显微镜或 nano-scopic 光传感器应用和 photonic 微设备。用光纤维的光传感器系统和技术实现的小型化能为新应用向新传感器图案提供改进性质和功能。明确地做的硅石纤维选择蚀刻是一个有希望的方法以便形成复杂 photonic 在结束或在象在为所有纤维传感器和成像应用有用的各种各样的形状的尖端和洞那样的纤维以内的微结构。在现在的学习，我们调查了准备几何上预先规定，由利用高度做的步索引纤维的掺杂物集中侧面的 nanoscaled 纤维尖端。为这个目的，蚀刻过程使用的一个煤气的阶段氟氢的酸(HF ) 蒸汽被使用。塑造纤维建议由于特定的光纤维的做的特征基于很不同的蚀刻的率。塑造的时间的尖端和最后的几何学上的蚀刻的煤气的空气的影响上的工艺的研究用 undoped 被执行并且做了硅石纤维。做的特征的影响在磷被调查 -- ，金者 -- ，做氟的符号、做硼的玻璃纤维。狭窄在半径击倒到不到 15 nm 的各种各样的形状和尖端暴露了以及保护内部纤维尖端几何上并且拓扑地被完成并且描绘。为进表面电浆子回声效果的调查，纤维尖端与借助于蒸汽免职的纳米大小的银层是涂的并且最后使遭到了到一个退火的处理。