Combination of an Axicon Fiber Tip and a Camera Device into a Sensitive Refractive Index Sensor
Combination of an Axicon Fiber Tip and a Camera Device into a Sensitive Refractive Index Sensor
复制标题
DOI：
10.3390/s19224911
复制
发表时间：
2019-11
期刊：
影响因子：
--
通讯作者：
Yi-Hsin Tai;Po-Cheng Tsai;Y. Ho;J. Delaunay;P. Wei
中科院分区：
文献类型：
--
作者：
Yi-Hsin Tai;Po-Cheng Tsai;Y. Ho;J. Delaunay;P. Wei
开发了与摄像装置相结合的轴锥光纤尖端，用于灵敏地检测溶液中的折射率。透明轴棱镜尖端是通过在室温下通过湿端蚀刻方法蚀刻光纤而制成的。当轴锥光纤尖端浸入各种折射率介质中时，从轴锥光纤尖端发射的光的角谱发生变化。使用低数值孔径透镜收集直接透射的光，当尖端锥角约为35至40度时，可以获得高强度灵敏度。我们将轴锥光纤尖端与激光二极管和智能手机组合成便携式折光仪。智能手机的前置摄像头用于收集轴锥光纤尖端发出的光。通过分析捕获图像的选定区域，可以区分各种解决方案的折射率。折射率灵敏度高达56,000%/RIU，检测限为1.79 × 10−5 RIU。通过轴锥光纤尖端测量折射率变化，可以灵敏地检测不同介质的浓度。蔗糖溶液、盐溶液和稀释酒的测量检出限分别为8.86×10−3°Bx、0.12‰和0.35%。
An axicon fiber tip combined with a camera device is developed to sensitively detect refractive indexes in solutions. The transparent axicon tips were made by etching optical fibers through a wet end-etching method at room temperature. When the axicon fiber tip was immersed in various refractive index media, the angular spectrum of the emitted light from the axicon fiber tip was changed. Using a low numerical aperture lens to collect the directly transmitted light, a high intensity sensitivity was achieved when the tip cone angle was about 35 to 40 degrees. We combined the axicon fiber tip with a laser diode and a smartphone into a portable refractometer. The front camera of the smartphone was used to collect the light emitted from the axicon fiber tip. By analyzing the selected area of the captured images, the refractive index can be distinguished for various solutions. The refractive index sensitivity was up to 56,000%/RIU, and the detection limit was 1.79 × 10−5 RIU. By measuring the refractive index change via the axicon fiber tip, the concentration of different mediums can be sensitively detected. The detection limits of the measurement for sucrose solutions, saline solutions, and diluted wine were 8.86 × 10−3 °Bx, 0.12‰, and 0.35%, respectively.