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建立了基于波长调制的Kretschmann结构表面等离子体共振(SPR)传感器系统中整形光路和探测光斑直径与会聚角关系的理论模型。分析了探测光束会聚角对SPR传感器共振波长、共振曲线半峰全宽和共振峰深度的影响。随着探测光束会聚角的减小,共振波长增大,共振曲线的半峰全宽减小,共振峰深度增大,传感器的抗干扰能力增强,系统分辨率提高。通过实验对此进行了验证,考虑会聚角时实验与仿真结果符合得较好;会聚角从0.8°减小到0°时,共振波长从662nm减小到623nm,共振曲线半峰全宽从157nm减小到117nm,共振峰深度从70.5%增大到93.3%。
A theoretical model of the shaping optical path and the relationship between the spot diameter and the convergence angle in a Kretschmann surface plasmon resonance (SPR) sensor system based on wavelength modulation was established. The influence of the convergence angle of the probe beam on the resonance wavelength, the full width at half maximum of the resonance curve and the depth of the resonance peak is analyzed. As the convergence angle of the probe beam decreases, the resonance wavelength increases, the full width at half maximum of the resonance curve decreases, the resonance peak depth increases, the antijamming capability of the sensor increases and the system resolution increases. The experimental results show that the convergence angle is in good agreement with the simulation results. When the convergence angle decreases from 0.8 ° to 0 °, the resonance wavelength decreases from 662 nm to 623 nm and the full width at half maximum of resonance curve changes from 157 nm Reduced to 117nm, the resonance peak depth increased from 70.5% to 93.3%.