Design of Modulation Transfer Function Test System for Ultraviolet Image Intensifiers
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摘要: 紫外像增强器是紫外成像系统的核心器件，其成像质量决定了对紫外光学信号的探测和成像能力。调制传递函数（Modulation Transfer Function，MTF）反映了系统对图像不同频率信息的传递能力，是像质评定的一种客观指标。本文基于狭缝成像和傅里叶分析的调制传递函数测试原理，设计了一套紫外像增强器的调制传递函数测试系统。然后对3支紫外像增强器进行了调制传递函数测试实验，得到3支紫外像增强器的MTF曲线截止频率均在32~34 lp/mm之间，并根据MTF曲线对3支紫外像增强器成像质量进行对比分析。最后经过重复测试得到几个重要频率点MTF测试值的标准差均低于0.02。Abstract: The ultraviolet (UV) image intensifier is the core device of an UV imaging system. Its imaging quality determines its ability to detect and image UV optical signals. The modulation transfer function (MTF) represents the system's ability to transfer information at different frequencies and is an objective indicator of image quality assessment. Based on the MTF test principle of slit imaging and the Fourier analysis method, a set of MTF test systems for UV image intensifiers is established in this study. MTF test experiments were performed on three UV image intensifiers. The MTF curve cutoff frequencies of the three UV image intensifiers were between 32 and 34 lp/mm, and the imaging quality of the three UV image intensifiers was compared based on the MTF curves. Finally, the standard deviations of the MTF values of several important frequency points obtained from repeated tests were lower than 0.02.
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图 6 紫外像增强器Ⅰ重复测试得到的4条MTF曲线
Figure 6. Four MTF curves obtained by repeated testing of UV image intensifier Ⅰ
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图 7 紫外像增强器Ⅱ重复测试得到的4条MTF曲线
Figure 7. Four MTF curves obtained by repeated testing of UV image intensifier Ⅱ
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图 8 紫外像增强器Ⅲ重复测试得到的4条MTF曲线
Figure 8. Four MTF curves obtained by repeated testing of UV image intensifier Ⅲ
表 1 重要频率点测试得到的MTF平均值
Table 1 MTF average values at important frequency points
Frequency /
(lp/mm)2.5 7.5 15.0 25.0 30.0 Sample Ⅰ 0.8133 0.4900 0.2325 0.0753 0.0410 Sample Ⅱ 0.7983 0.4690 0.2136 0.0727 0.0386 Sample Ⅲ 0.9443 0.6225 0.2838 0.0793 0.0334 
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表 2 重要频率点测试得到的MTF标准差
Table 2 MTF standard deviation at important frequency points
Frequency /(lp/mm) 2.5 7.5 15.0 25.0 30.0 Sample Ⅰ 0.0183 0.0123 0.0097 0.0084 0.0046 Sample Ⅱ 0.0147 0.0108 0.0090 0.0029 0.0019 Sample Ⅲ 0.0075 0.0068 0.0054 0.0028 0.0006
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[1] 王颢, 王璐子, 倪进园, 等. 日盲紫外波段电晕成像特性的仿真研究[J]. 红外技术, 2019, 41(11): 1057-1064. https://www.cnki.com.cn/Article/CJFDTOTAL-HWJS201911010.htm WANG Hao, WANG Luzi, NI Jinyuan, et al. Research on simulation of corona imaging at solar-blind ultraviolet band[J]. Infrared Technology, 2019, 41(11): 1057-1064. https://www.cnki.com.cn/Article/CJFDTOTAL-HWJS201911010.htm
[2] 权利, 王颖, 龙维刚, 等. 紫外图像传感器技术研究进展[J]. 半导体光电, 2013, 34(4): 537-541. https://www.cnki.com.cn/Article/CJFDTOTAL-BDTG201304002.htm QUAN Li, WANG Ying, LONG Weigang, et al. Advances in UV image sensor technology[J]. Semiconductor Optoelectronics, 2013, 34(4): 537-541. https://www.cnki.com.cn/Article/CJFDTOTAL-BDTG201304002.htm
[3] 崔穆涵. 日盲紫外像增强器与ICCD的参量测试与辐射标定[D]. 北京: 中国科学院研究生院, 2016. CUI Muhan. Parametric Test and Radiometric Calibration of the Solar-Blind UV Image Intensifier and Intensified CCD[D]. Beijing: Graduate School of Chinese Academy of Sciences, 2016.
[4] 朱宏权. 微通道板像增强器的调制传递函数的测量与研究[J]. 光子学报, 2007, 36(11): 1983-1986. https://www.cnki.com.cn/Article/CJFDTOTAL-GZXB200711006.htm ZHU Hongquan. Measurement and research on modulation transfer function of microchannel plate image intensifier [J]. Journal of Photonics, 2007, 36(11): 1983-1986. https://www.cnki.com.cn/Article/CJFDTOTAL-GZXB200711006.htm
[5] 黄贤斌. 微光像增强器调制传递函数测试技术研究[D]. 南京: 南京理工大学, 2017 HUANG Xianbin. Research on Testing Technology of Modulation Transfer Function of Low Light Level Image Intensifier[D]. Nanjing: Nanjing University of Science and Technology, 2017.
[6] 倪进园, 王璐子, 王颢, 等. 微光像增强器的MTF测试技术研究[J]. 红外技术, 2019, 41(12): 1161-1166. http://hwjs.nvir.cn/article/id/hwjs201912012 NI Jinyuan, WANG Luzi, WANG Hao, et al. Research on measurement technology of the MTF of low-light level image intensifiers[J]. Infrared Technology, 2019, 41(12): 1161-1166. http://hwjs.nvir.cn/article/id/hwjs201912012
[7] 陶禹, 金伟其, 王瑶, 等. 高性能近贴式像增强器的调制传递函数分析[J]. 光子学报, 2016, 45(6): 168-173. https://www.cnki.com.cn/Article/CJFDTOTAL-GZXB201606027.htm TAO Yu, JIN Weiqi, WANG Yao, et al. The MTF analysis of high performance proximity image intensifier[J], Journal of Photonics, 2016, 45(6): 168-173. https://www.cnki.com.cn/Article/CJFDTOTAL-GZXB201606027.htm
[8] 何丽鹏, 林峰. 紫外工业检测光学系统设计及公差分析[J]. 激光与光电子学进展, 2018, 55(10): 294-298. https://www.cnki.com.cn/Article/CJFDTOTAL-JGDJ201810040.htm HE Lipeng, LIN Feng. Design and tolerance analysis of UV industrial inspection optical system[J]. Laser and Optoelectronics Progress, 2018, 55(10): 294-298. https://www.cnki.com.cn/Article/CJFDTOTAL-JGDJ201810040.htm
[9] 贺英萍, 李敏, 尹雷, 等. 紫外像增强器分辨力和视场质量测试技术研究[J]. 应用光学, 2012, 33(2): 337-341. https://www.cnki.com.cn/Article/CJFDTOTAL-YYGX201202022.htm HE Yingping, LI Min, YIN Lei, et al. Resolution and FOV quality of UV image intensifier[J]. Applied Optics, 2012, 33(2): 337-341. https://www.cnki.com.cn/Article/CJFDTOTAL-YYGX201202022.htm
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