为了更好地测量液体折射率, 提出了一种基于表面等离子共振波长测量液体折射率的方法,采用Kretschman 结构建立了模型, 进行了软件仿真, 并搭建实验平台进行了实验研究, 分析了实验和理论之间的误差来源。结果表明,当折射率在1.33RIU~1.36RIU的范围内变化时, 表面等离子共振吸收峰随液体样品折射率的变化产生了频移, 其灵敏度可达4808.94nm/RIU。该方法可以准确测量液体的折射率, 且系统结构简单, 具有较高的灵敏度。

In order to measure refractive index of liquid more accurately, one method based on surface plasma resonance wavelength was proposed. The model was built by using Kretschman structure and software simulation was carried out. The experimental platform was set up and the experimental research was carried out. The error between experimental and theoretical results was analyzed. The results show that, when the refractive index changes within the range of 1.33RIU~1.36RIU, the absorption peak of surface plasma resonance produces a frequency shift with the change of refractive index of liquid sample. And its sensitivity is up to 4808.94nm/RIU. Refractive index of liquid can be measured accurately with the method and the system has simple structure and high sensitivity.