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针对基于SPR效应的两类典型光纤型传感器:传统型包层腐蚀的镀金属多模光纤传感器、新型镀金属单模光纤光栅传感器,指出其不同的SPR模型处理方法及传感特性。首先,根据传统型SPR光纤传感器的结构特点,利用平板SPR理论给出反射谱特性,同时指出并证明薄膜光学理论在平板SPR结构中与平板SPR理论的等价性。其次,针对新型SPR光纤光栅传感器结构特点,依据模式耦合思想,结合SPW模式特征,提出了光纤光栅SPR结构的理论处理方法,得到了镀金膜三包层LPFG结构的透射谱。最后,对基于SPR效应的两类典型光纤型传感器的传感特性进行了比较分析,结果表明,两类传感器对环境折射率均具有较高的分辨率,但新型光纤光栅SPR传感器的分辨率高出传统SPR光纤传感器3个数量级。
Based on the SPR effect, two types of typical fiber optic sensors: the traditional cladding metallized multimode fiber sensor and the new metal-plated single-mode fiber grating sensor, and pointed out the different SPR model processing methods and sensing characteristics. First of all, according to the structural characteristics of the traditional SPR optical fiber sensor, the SPR theory is used to give the reflection spectrum characteristics. At the same time, the equivalence between the SPT theory and the planar optical theory is demonstrated and proved. Secondly, in view of the structural characteristics of the novel SPR FBG sensor, based on the idea of mode coupling and the SPW mode characteristics, a theoretical treatment method of the SPR structure of the FBG is proposed and the transmission spectrum of LPFG with gold cladding is obtained. Finally, the sensing characteristics of two typical fiber optic sensors based on the SPR effect are compared and analyzed. The results show that both types of sensors have higher resolution for the environmental refractive index. However, the resolution of the novel fiber grating SPR sensor is high The traditional SPR optical fiber sensor 3 orders of magnitude.