深圳大学学报理工版

廖昱博,龙井华,蔡厚智,等.相同激励下双磁透镜分幅变像管的成像研究[J].深圳大学学报理工版,2016,33(06):593-598.[doi:10.3724/SP.J.1249.2016.06593 ]
Liao Yubo,Long Jinghua,Cai Houzhi,et al.Imaging evaluation of magnetic double-lens framing tube under the same excitation[J].Journal of Shenzhen University Science and Engineering,2016,33(06):593-598.[doi:10.3724/SP.J.1249.2016.06593 ]

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相同激励下双磁透镜分幅变像管的成像研究

廖昱博^1,2,龙井华³,蔡厚智¹,陈家堉¹,刘进元¹

1)深圳大学光电子器件与系统教育部重点实验室,广东深圳 518060; 2)赣南师范大学物理与电子信息学院, 江西赣州 341000; 3)深圳大学物理与能源学院,广东深圳 518060

关键词：核仪器仪表; 超快诊断技术; 分幅变像管; 双磁透镜; 激励条件; 成像规律

Imaging evaluation of magnetic double-lens framing tube under the same excitation

Liao Yubo^1,2,Long Jinghua^3,Cai Houzhi¹,Chen Jiayu¹,and Liu Jinyuan¹

Liao Yubo^1,2,Long Jinghua^3,Cai Houzhi¹,Chen Jiayu¹,and Liu Jinyuan¹1)Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education, Shenzhen University, Shenzhen 518060,Guangdong Province, P.R.China2)School of Physics and Electronic Information Science, Gannan Normal University, Ganzhou 341000, Jiangxi Province, P.R.China3)College of Physics and Energy, Shenzhen University, Shenzhen 518060,Guangdong Province, P.R.China

Keywords： nuclear instrumentation; ultrafast diagnostic technique; framing tube; magnetic double lenses; excitation condition; imaging rules

DOI: 10.3724/SP.J.1249.2016.06593

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设计研制了大面积阴极双磁透镜分幅变像管,考察双磁透镜系统相同激励下1:1的成像.从薄透镜成像关系出发,分析满足成像条件的4种情况,并求得各种情况下双透镜位置与焦距的关系式.通过阴极微带光刻分辨率板法进行成像的测试与验证. 测试结果表明,双磁透镜仅在少数几个位置能成较高质量的1:1像. 影响双磁透镜像管1:1成像的因素主要包括磁透镜的磁化饱和效应、铁磁材料间的磁场干扰以及透镜厚度.

A large cathode framing tube is designed and developed. Its imaging at a magnification ratio of 1:1 is investigated by using a magnetic double-lens system with the same excitation. Firstly, based on the imaging formula of thin lens, four imaging situations are analyzed, and the relationship between the positions of the two magnetic lenses and the focal length is derived. Then, resolution plates photo-etched on the cathode micro-stripe are adopted to test the imaging quality of the tube under the four situations. The test results show that 1:1 imaging with higher image quality occurs only when the double lenses are placed in a few positions. The factors that affect the 1:1 imaging of the magnetic double-lens system are mainly the magnetization saturation effect of the lens, magnetic-field interference between the ferromagnetic materials of the two lenses, and the lens thickness.

引言
1 相同激励下双透镜成等大像的条件
2 静态测试与结果分析
3 结语

图1 为两次成像均为实物成实像时的双透镜位置. 可见,此时中间像位于L1与L2之间,且L1的物距s1>f. 两次成像满足高斯成像关系<br/>1/(s1)+1/(s1')=1/f(2)<br/>1/(s2)+1/(s2')=1/f(3)<br/>图1 两次成像均为实物成实像时的双透镜位置<br/>Fig.1 The positions of the double lenses at which the two real images are formed

图1 为两次成像均为实物成实像时的双透镜位置. 可见,此时中间像位于L1与L2之间,且L1的物距s1>f. 两次成像满足高斯成像关系
1/(s1)+1/(s1')=1/f(2)
1/(s2)+1/(s2')=1/f(3)
图1 两次成像均为实物成实像时的双透镜位置
Fig.1 The positions of the double lenses at which the two real images are formed

图2 中间像为虚像时的双透镜位置<br/>Fig.2 The positions of the double lenses at which a virtual intermediate image is formed

图2 中间像为虚像时的双透镜位置
Fig.2 The positions of the double lenses at which a virtual intermediate image is formed

图3 MCP微带的CCD图像<br/>Fig.3 The image acquired by CCD of micro-stripes on the MCP

图3 MCP微带的CCD图像
Fig.3 The image acquired by CCD of micro-stripes on the MCP

表1 双磁透镜均为实物成实像时的透镜位置与成像激励<br/>Table 1 The positions and imaging excitations of the magnetic double lenses at which two real images are formed

表1 双磁透镜均为实物成实像时的透镜位置与成像激励
Table 1 The positions and imaging excitations of the magnetic double lenses at which two real images are formed

图4 双透镜均为实物成实像时的测试结果(s=130 mm)<br/>Fig.4 One of the test results for the double-lens system when the two lenses are placed to form two real images(s=130 mm)

图4 双透镜均为实物成实像时的测试结果(s=130 mm)
Fig.4 One of the test results for the double-lens system when the two lenses are placed to form two real images(s=130 mm)

表2 双磁透镜在几种不同位置下的成像激励电流<br/>Table 2 The imaging excitations of the magnetic double lenses placed at several different positions

表2 双磁透镜在几种不同位置下的成像激励电流
Table 2 The imaging excitations of the magnetic double lenses placed at several different positions

图5 双磁透镜在几种不同位置下的1:1成像测试图(上为s1=11.0 cm, s2'=14.0 cm; 中为s1=12.0 cm, s2'=13.0 cm; 下为s1=13.0 cm, s2'=12.0 cm)<br/>Fig.5 The test images at 1:1 magnification ratio formed when the double lenses are placed at several different positions(Upper s1=11.0 cm, s2'=14.0 cm; middle s1=12.0 cm, s2'=13.0 cm; lower s1=13.0 cm, s2'=12.0 cm)

图5 双磁透镜在几种不同位置下的1:1成像测试图(上为s1=11.0 cm, s2'=14.0 cm; 中为s1=12.0 cm, s2'=13.0 cm; 下为s1=13.0 cm, s2'=12.0 cm)
Fig.5 The test images at 1:1 magnification ratio formed when the double lenses are placed at several different positions(Upper s1=11.0 cm, s2'=14.0 cm; middle s1=12.0 cm, s2'=13.0 cm; lower s1=13.0 cm, s2'=12.0 cm)

表3 物、像分别位于L1前焦面和L2后焦面时的透镜放置与成像激励电流<br/>Table 3 The positions and imaging excitations of the magnetic double lenses when the object plane and the image plane are placed at the front focal plane of lens 1 and the back focal plane of lens 2, respectively

表3 物、像分别位于L1前焦面和L2后焦面时的透镜放置与成像激励电流
Table 3 The positions and imaging excitations of the magnetic double lenses when the object plane and the image plane are placed at the front focal plane of lens 1 and the back focal plane of lens 2, respectively

图6 阴极物面和成像面分别位于L1前焦面和L2后焦面时的测试图像.从左至右分别对应:s=11.0、12.5、13.0、15.0及 17.0 cm<br/>Fig.6 The test images acquired when the cathode object plane and the image plane are placed at the front focal plane of lens 1 and the back focal plane of lens 2, respectively. From left to right: s=11.0, 12.5, 13.0, 15.0 and 17.0 cm

图6 阴极物面和成像面分别位于L1前焦面和L2后焦面时的测试图像.从左至右分别对应:s=11.0、12.5、13.0、15.0及 17.0 cm
Fig.6 The test images acquired when the cathode object plane and the image plane are placed at the front focal plane of lens 1 and the back focal plane of lens 2, respectively. From left to right: s=11.0, 12.5, 13.0, 15.0 and 17.0 cm