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Measurement of air refractive index based on surface plasmon resonance and phase detection

机译：基于表面等离子体共振和相位检测的空气折射率测量

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摘要

A method for refractive index of air measurement is presented based on surface plasmon resonance (SPR) and phase detection using a dual-frequency laser interferometer. Theoretical analyses indicate that the phase-difference variation of the measurement signal versus the reference signal is linear with refractive index of air (RIA) fluctuation, and the calculation formula of RIA is derived. The structure design of the self-adaptive SPR sensor greatly reduces the measurement error resulting from the incident angle shift and improves the sensitivity. The experiments show that measurement uncertainty of 10~(-6) order has been achieved when phase detection precision is 0.1 deg. The phenomenon of sudden phase variation during air pumping and air filling, which is caused by temperature fluctuation, is discussed.
机译：提出了一种基于表面等离子体共振（SPR）和双频激光干涉仪相位检测的空气折射率测量方法。理论分析表明，测量信号与参考信号的相位差变化与空气折射率（RIA）波动呈线性关系，并推导了RIA的计算公式。自适应SPR传感器的结构设计大大降低了入射角偏移导致的测量误差，提高了灵敏度。实验表明，当相位检测精度为0.1 deg时，测量不确定度达到10~（-6）级。讨论了由温度波动引起的空气泵送和充气过程中突然相变的现象。

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  • 来源
    《Optics Letters》 |2012年第14期|2916-2918|共3页
  • 作者

    Qianghua Chen; Huifu Luo; Sumei WangFeng Wang;

  • 作者单位

    Key Laboratory of Advanced Machining Fundamental Science, School of Mechanical Engineering, Beijing Institute of Technology, Teaching Building 1, 5 South Zhongguancun Street, Haidian District, Beijing 100081, China;

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  • 正文语种 英语
  • 中图分类 计量学;
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