Stray light analysis of low-level-light optical system with LightTools software
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摘要: 为解决低照度微弱信号探测的微光光学系统杂散光问题，研究了杂散光的原理和特性。利用光学系统建模软件LightTools对微光光学系统进行仿真建模，并开展杂散光分析。为减少杂散光，在物镜筒的筒壁加工消光螺纹，并针对不同形式的消光螺纹，开展了能量仿真模拟。仿真结果表明，采用螺距0.35 mm的消光螺纹，能够将杂散光系数从7%降低到4%。仿真分析结果与实验结果一致，为其他微弱信号探测光学系统在设计阶段对杂散光进行消除提供了指导。
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关键词:
- 杂散光 /
- 微光光学系统 /
- 消光螺纹 /
- LightTools软件
Abstract: To solve the problem of stray light in low-level-light optical system detected by low illumination weak signal, the principle and characteristics of stray light were studied. The optical system modeling software LightTools was used to simulate the low-level-light optical system and analyze the stray light. In order to reduce stray light, the extinction threads were processed on the barrel wall of the objective lens barrel, and the energy simulation was carried out for different forms of extinction threads. The simulation results show that the stray light coefficient can be reduced from 7% to 4% by using the extinction thread with the pitch of 0.35 mm, which are consistent with the experimental results, and can provide guidance for the elimination of stray light in the design of optical systems with weak signal detection.-
Key words:
- stray light /
- low-level-light optical system /
- extinction thread /
- LightTools software
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图 2 设置防杂散光光阑的镜筒示意图
Fig. 2 Schematic diagram of objective lens barrel with anti-stray light diaphragm
图 5 螺纹M0.5物镜杂散光能量模拟图
Fig. 5 Simulation diagram of stray light energy of thread M0.5 objective lens
图 6 螺纹M0.35物镜杂散光能量模拟图
Fig. 6 Simulation diagram of stray light energy of thread M0.35 objective lens
表 1 微光光学系统技术指标
Table 1 Technical indexes of low-level-light optical system
参数 数值 波长/nm 450～850 视场/(°) 10 焦距/mm 112 口径/mm 75 F数 1.5 轴上调制传递函数@50 lp/mm >0.4 
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表 2 微光物镜（螺纹M0.5）杂散光测量值
Table 2 Stray light measurement values of low-level-light objective lens (thread M0.5)
产品编号 1# 2# 3# 4# 5# 6# 7# 平均值 杂散光
系数/%5.20 4.20 4.30 4.90 4.90 4.20 4.50 4.60
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表 3 微光物镜（螺纹M0.35）杂散光测量值
Table 3 Stray light measurement values of low-level-light objective lens (thread M0.35)
产品编号 1# 2# 3# 平均值 杂散光系数/% 3.90 4.00 4.20 4.03
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