Wei Yong, Su Yudong, Liu Chunlan, Nie Xiangfei, Liu Zhihai, Zhang Yu, Zhang Yonghui
Key Laboratory of Intelligent Information Processing and Control, Chongqing Three Gorges University, Wanzhou, Chongqing 404100, China.
College of Electronic ＆ Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China.
Sensors (Basel). 2017 Dec 9;17(12):2862. doi: 10.3390/s17122862.
By combining a polymer-clad optic fiber and a vitreous-clad optic fiber, we proposed and fabricated a novel optic fiber surface plasmon resonance (SPR) sensor to conduct two-channel sensing at the same detection area. The traditional optic fiber SPR sensor has many disadvantages; for example, removing the cladding requires corrosion, operating it is dangerous, adjusting the dynamic response range is hard, and producing different resonance wavelengths in the sensing area to realize a multi-channel measurement is difficult. Therefore, in this paper, we skillfully used bare fiber grinding technology and reverse symmetry welding technology to remove the cladding in a multi-mode fiber and expose the evanescent field. On the basis of investigating the effect of the grinding angle on the dynamic range change of the SPR resonance valley wavelength and sensitivity, we combined polymer-clad fiber and vitreous-clad fiber by a smart design structure to realize at a single point a two-channel measurement fiber SPR sensor. In this paper, we obtained a beautiful spectral curve from a multi-mode fiber two-channel SPR sensor. In the detection range of the refractive rate between 1.333 RIU and 1.385 RIU, the resonance valley wavelength of channel Ⅰ shifted from 622 nm to 724 nm with a mean average sensitivity of 1961 nm/RIU and the resonance valley wavelength of channel Ⅱ shifted from 741 nm to 976 nm with a mean average sensitivity of 4519 nm/RIU.
通过将聚合物包层光纤和玻璃包层光纤相结合，我们提出并制造了一种新型光纤表面等离子体共振（SPR）传感器，以在同一检测区域进行双通道传感。传统的光纤SPR传感器存在许多缺点；例如，去除包层需要腐蚀，操作危险，调整动态响应范围困难，并且在传感区域产生不同的共振波长以实现多通道测量也很困难。因此，在本文中，我们巧妙地利用裸光纤研磨技术和反轴对称焊接技术去除多模光纤中的包层并暴露倏逝场。在研究研磨角度对SPR共振谷波长和灵敏度的动态范围变化的影响的基础上，我们通过巧妙的设计结构将聚合物包层光纤和玻璃包层光纤相结合，以实现单点双通道测量光纤SPR传感器。在本文中，我们从多模光纤双通道SPR传感器获得了一条漂亮的光谱曲线。在折射率1.333 RIU至1.385 RIU的检测范围内，通道Ⅰ的共振谷波长从622 nm移至724 nm，平均灵敏度为1961 nm/RIU，通道Ⅱ的共振谷波长从741 nm移至976 nm，平均灵敏度为4519 nm/RIU。
