提出了一种新型的基于镀银空芯光纤结构的表面等离子体共振（SPR）传感器。建立了光学模型对传感器内的光传播进行分析，在理论上推导出了传输光谱公式。制作了不同银膜厚度的空芯光纤SPR传感器，搭建了实验系统对内芯充入不同折射率的液体介质的传感器传输光谱进行了测量，获得了相应的SPR光谱。通过理论计算和实验测量对传感器的灵敏度特性和测量准确性进行了分析讨论。结果表明该传感器是一种灵敏度较高的、能实时检测待测高折射率液体介质的SPR传感器，它在一定范围内能够很好地弥补传统光纤表面等离子体共振传感器的不足，并且开拓了空芯光纤的一个新的应用领域。

A new kind of surface plasmon resonance (SPR) sensor based on hollow-core fiber structure is proposed. The performance of the designed sensor is theoretically analyzed with a ray model theory. Sensors with different silver film thicknesses are fabricated. An online testing system is set up and the SPR spectra of liquids filled in the fiber core with different refractive indices are obtained with the sensors of different silver layer thicknesses. Sensitivity and detection accuracy of the sensors are investigated both theoretically and experimentally. The designed sensor is a kind of fiber SPR sensor with high sensitivity, which can detect the high refractive index liquid medium in real time. It can make up the deficiency of the conventional fiber SPR sensor in a certain range and open up a new application field for hollow-core fiber.