Plastic Optical Fiber Based SPR Sensor for Simultaneous Measurement of Refractive Index and Liquid Level
Plastic Optical Fiber Based SPR Sensor for Simultaneous Measurement of Refractive Index and Liquid Level
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DOI：
10.1109/jsen.2022.3155723
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发表时间：
2022-04-01
影响因子：
4.3
通讯作者：
Yuan, Libo
中科院分区：
文献类型：
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作者：
Teng, Chuanxin;Wang, Youwei;Yuan, Libo
在这项工作中，提出并演示了一种基于塑料光纤（POF）的表面等离子体共振（SPR）传感器，用于同时测量折射率（RI）和液位。传感器探针是通过抛光POF并沿光纤轴向钻几个等间距的微孔而制成的，在抛光区域沉积一层金膜后，得到SPR探针。研究了微孔对传感性能的影响并优化了微孔的结构参数。实验结果表明，通过监测SPR峰的波长位置可以检测液体RI的变化，通过监测SPR峰的深度可以测量液位。在1.335-1.40的RI范围内获得了2024.41 nm/RIU的RI灵敏度，并且该探头的液位测量分辨率为5 mm，测量范围为25 mm。所提出的传感器尺寸紧凑，并且对于折射率和液位测量具有非常小的交叉灵敏度，这在生物医学和工业传感领域非常有用。
In this work, a plastic optical fiber (POF) based surface plasmon resonance (SPR) sensor is proposed and demonstrated for simultaneous measurement of refractive index (RI) and liquid level. The sensor probe is fabricated by polishing the POF and drilling several micro-holes with equal pitch along the fiber axial, after depositing a layer of gold film on the polished region, the SPR probe is obtained. The effects of the micro-hole on the sensing performance are investigated and the structural parameters of the micro hole are optimized. Experimental results show that the changes of the liquid RI can be detected by monitoring the wavelength position of the SPR peak, and the liquid level can be measured by monitoring the deepness of the SPR peak. An RI sensitivity of 2024.41 nm/RIU was obtained in the RI range of 1.335-1.40, and a resolution of 5 mm and measurement range of 25 mm for liquid level measurement were achieved for the probe. The proposed sensor is compact in size and has a very small cross sensitivity for the RI and liquid level measurement, which is useful in the biomedical and industrial sensing fields.