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设计了一种双通道表面等离子体共振光纤传感器,分析了Au、Cu两种材料对波长调制型表面等离子体共振光纤传感器的影响,优化了金属厚度并且选取优化后的金属厚度d_(Au)=47 nm,d_(Cu)=53 nm进行数值仿真分析。结果表明,金属层为金的通道比金属层为铜的通道灵敏度高,但是金属层为铜的通道比金属层为金的通道检测精度高4倍;金属层为金的传感通道适合检测折射率较低的物质,而金属层为铜的传感通道适合检测折射率较高的物质,该传感器的提出扩大了单一传感器的应用范围,并且文中提出的传感器比传统的SPR传感器检测精度高,灵敏度和单通道传感器一样。
A two-channel surface plasmon resonance optical fiber sensor was designed. The effects of Au and Cu on wavelength-modulated surface plasmon resonance optical fiber sensor were analyzed. The optimal thickness of metal was optimized and the optimized metal thickness d Au = 47 nm, d Cu (Cu) = 53 nm for numerical simulation. The results show that the channel with gold layer is more sensitive than the channel with copper layer, but the channel with copper layer is 4 times more sensitive than the channel with gold layer. The sensing channel with gold layer is suitable for detecting the refraction And the sensing layer of metal layer is suitable for detecting material with higher refractive index. The proposed sensor expands the application range of a single sensor, and the sensor proposed in the paper has higher detection precision than the traditional SPR sensor, The same sensitivity and single-channel sensor.