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| 用于电晕检测的日盲紫外光学系统设计 |
| Design of a solar blind ultraviolet optical system for corona detection |
| 投稿时间：2022-12-11 |
| DOI：10.3969/j.issn.1005-5630.2023.004.006 |
| 中文关键词: 日盲紫外 光学设计 Zemax 公差分析 |
| 英文关键词:solar blind optical design Zemax tolerance analysis |
| 基金项目:福建省科技厅引导性项目(2017H0010)；福建省科技重大专项（2021YZ040012） |
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| 中文摘要: |
| 日盲紫外光学探测器可以精准的接收到电晕放电产生的紫外辐射。利用Zemax软件设计了一款定焦日盲紫外光学系统，该系统由五片球面透镜构成，工作波段240 ~280 nm，匹配靶面直径18 mm的紫外像增强器，F数为2.5，焦距为50 mm，视场角为20.4°，光学总长为72 mm。调制传递函数在空间频率20 lp/mm处全视场均大于0.8，最大畸变小于0.5％。分析了系统在-20 ~60 ℃的离焦现象，计算了各温度下的热离焦量，采用被动式机械补偿的方法校正了由温度变化产生的热差。最后，通过蒙特卡洛分析模拟，对系统给出了合理的公差分配，分析结果表示系统加工装配后仍具有较好的成像质量。 |
| 英文摘要: |
| The solar blind ultraviolet optical detector accurately captures the ultraviolet radiation generated by corona discharge. In this paper, a fixed focal solar blind optical system was designed by using Zemax. The system comprises five standard spherical lens and has a working wavelength range of 240-280 nm, the F number of 2.5, the focal distance of 50 mm, a field angle of 20.4°，an optical length of 72 mm and matches with a ultraviolet image intensifier with a target diameter of 18 mm. The full field of modulation transfer function is greater than 0.8 at the spatial frequency of 20 lp/mm, the maximum distortion is less than 0.5％. The defocusing phenomenon of the system was analyzed across a temperature range of -20℃ to 60℃. The thermal defocusing amount was calculated at different temperatures, and a Passive mechanical compensation method was employed to correct thermal dispersion caused by temperature changes. Finally, through Monte Carlo simulation analysis, the system is given a reasonable tolerance allocation. The analysis results show that the system still maintains good imaging quality even after processing and assembly. |
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