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采用自行搭建的基于表面等离子共振原理的传感器系统,研究了作为敏感层的不同银膜厚度对表面等离子共振敏感度的影响,并给出了最佳的银膜层厚度。根据表面等离子共振(SPR)现象对金属表面介质折射率极为敏感的特点,在固定波长为632.8 nm的He-Ne激光入射下,利用厚度为50 nm的银薄膜作为敏感层的SPR传感器来测量不同浓度的酒精溶液。通过采用玻尔兹曼方程拟合方法,得出已知酒精溶液的浓度与SPR共振角的关系,从而实现对未知酒精溶液浓度的测量。实验证明测量的浓度分辨率可达0.5%。
A self-built sensor system based on surface plasmon resonance was used to study the influence of different silver film thickness on the surface plasmon resonance sensitivity as the sensitive layer, and the optimal silver film thickness was given. According to the fact that surface plasmon resonance (SPR) phenomenon is extremely sensitive to the refractive index of metal surface, the difference is measured by the SPR sensor with silver thin film of 50 nm as the sensitive layer under the incident of He-Ne laser with a fixed wavelength of 632.8 nm Concentration of alcohol solution. Through the use of Boltzmann equation fitting method, the relationship between the known alcohol solution concentration and SPR resonance angle was obtained, in order to achieve the measurement of the unknown alcohol solution concentration. Experiments show that the measured concentration resolution up to 0.5%.