光纤表面等离子体波传感器的温度特性的研究

本文从粒子振动的角度讨论了光纤表面等离子体波传感器对于温度的敏感特性。对于金属 /介质的表面等离子体波传感器 ,在界面处产生的等离子体振动实质是大量电子的集体振荡。在某一特定的波长的P光激励下 ,电子吸收了光子的能量而改变了原来的运动方式 ,当激励的光信号与电子群的固有振荡频率一致时 ,大量的电子振动变为一种谐振。由于界面处的电子密度与温度是密切相关的 ,不同的温度时密度不同———温度越高 ,电子的密度越大 ,而电子群的集体振荡又与电子的密度密切相关。所以温度的变化将对等离子体的共振频率产生非常重要的影响。利用了这一效应来补偿环境介质的温度变化 ,可以克服环境温度对测试所带来的影响。此外 ,本文也讨论了采用光纤SPW传感器可以进行多参数的测量。

Study on the Temperature Character of the Optic-fiber Surface-plasmon-wave Sensor

The paper discussed the optic-fiber surface-plasmon-wave(SPW) sensor's sensitivity to temperature based on the particle vibration. For the SPW sensor consisting of metal film and dielectric, surface plasmon vibration is essentially the vibration of group electrons. Being irradiated by P light that has a special wavelength, the electrons on the surface of the metal film will absorb the power and change the way of their original movement. When the frequency of the P light is corresponded to the inherent vibration frequency of the group electrons, resonance will occur. Because the different temperature leads to different electron density--the higher the temperature the higher the density on the film surface, and because the vibration of the group electrons is correlative to the electron density closely, the temperature change will influence the inherent vibration frequency of the surface plasmon seriously. We decrease the temperature influence on the SPW by compensating the temperature change of the environment medium according to the effect. On the other hand, the paper discusses that the optic-fiber SPW sensor may be used to measure multi-parameters.