Zhou Zhao, Chen He, Zhang Yin-chao, Chen Si-ying, Guo Pan, Mu Tao-tao
Guang Pu Xue Yu Guang Pu Fen Xi. 2017 Mar;37(3):772-7.
Stray light analysis has great benefits in designing Raman spectrometry system, which is the sensitive detection system of weak optical signal. In this paper, optical design software and Solidworks are utilized to optimize the optical and mechanical structure. The system resolution is 0.7 nm, and the volume is 110 mm×95 mm, which belongs to portable and miniature Raman spectrometer. Based on the stray light simulation model, we made an analysis of ray tracing simulation for this system. First, the stray light come with the incident ray were suppressed by the aperture stop. Then the receiver of stray light was introduced and improved in the design progress to suppress internal stray light, especially for zero-order diffraction light of plane grating. The improved receiver of stray light is more effectively using the internal space of the spectrometer and analysis results show that a 50% reduction in the number of stray light and stray light normalized irradiance intensity from 10-5 down to 10-7. The analysis shows that the improved receiver of stray light can effectively suppress stray light, which is beneficial to weak signal detection, and provide reference for design and adjustment of the miniature Raman spectrometer.
杂散光分析在拉曼光谱系统设计中具有很大益处，拉曼光谱系统是一种微弱光信号的灵敏检测系统。本文利用光学设计软件和Solidworks对光学和机械结构进行优化。该系统分辨率为0.7 nm，体积为110 mm×95 mm，属于便携式微型拉曼光谱仪。基于杂散光仿真模型，对该系统进行光线追迹仿真分析。首先，孔径光阑抑制了随入射光而来的杂散光。然后在设计过程中引入并改进了杂散光接收器以抑制内部杂散光，尤其是平面光栅的零级衍射光。改进后的杂散光接收器更有效地利用了光谱仪的内部空间，分析结果表明杂散光数量减少了50%，杂散光归一化辐照强度从10^-5降至10^-7。分析表明，改进后的杂散光接收器能有效抑制杂散光，有利于微弱信号检测，为微型拉曼光谱仪的设计与调试提供参考。
