深圳大学学报理工版

在X射线条纹相机静态测试中,发现分压电路的稳定性显著影响条纹相机成像性能.为提高成像稳定性,对分压电路进行测试,发现分压电路输出不稳定性由电流热效应导致,对此采用小电流分压电路方法,以降低电流热效应.测试和比较了两种分压电路的电压和电流输出,条纹相机静态成像性能和系统调制传递函数.理论分析和实验结果表明,相机在使用小电流分压电路加电20 min后,工作电流、温度及电子透镜焦距分别改变了1.4%、7.5%和0.14%,静态成像以及系统调制传递函数均优于原有方法.

In the static test of the X-ray streak camera,it is shown that the stability of the voltage divider circuit significantly affects the imaging performance of the streak camera. In order to improve the imaging stability, we analyze the voltage divider circuit. We find that the output instability of the voltage divider circuit is caused by the current thermal effect.The voltage circuit with smaller current is adopted to reduce the current thermal effect. We test and compare the voltages, current outputs, the static imaging performances of the streak cameras and the system modulation transfer functions for the two voltage dividers. Both theoretical analysis and experimental results show that after the camera has been powered with the smaller current divider circuit for 20 min, the operating current, the system temperature and electron lens focal length change by 1.4%, 7.5% and 0.14%, respectively.And the static image quality and modulation transfer function are improved.

引言
1 条纹变像管设计
2 分压电路影响与相机测试
3 理论分析
4 结语

图1 静态聚焦型条纹变像管示意图<br/>Fig.1 The diagram of electrostatic focusing streak tube

图1 静态聚焦型条纹变像管示意图
Fig.1 The diagram of electrostatic focusing streak tube

表1 条纹变像管电压参数<br/>Table 1 Streak tube voltage parameters

表1 条纹变像管电压参数
Table 1 Streak tube voltage parameters

图2 条纹相机静态测试原理图<br/>Fig.2 Schematic diagram of streak camera static experiment

图2 条纹相机静态测试原理图
Fig.2 Schematic diagram of streak camera static experiment

图3 条纹相机分压电路原理图(单位:MΩ)<br/>Fig.3 Schematic diagram of voltage divider circuits of the streak camera(unit: MΩ)

图3 条纹相机分压电路原理图(单位:MΩ)
Fig.3 Schematic diagram of voltage divider circuits of the streak camera(unit: MΩ)

图4 条纹相机使用分压器1静态测试图像<br/>Fig.4 The static experiment image of streak camera under voltage divider 1

图4 条纹相机使用分压器1静态测试图像
Fig.4 The static experiment image of streak camera under voltage divider 1

表2 条纹相机分压器1测试结果<br/>Table 2 Voltage divider 1 of streak camera experimental results

表2 条纹相机分压器1测试结果
Table 2 Voltage divider 1 of streak camera experimental results

图5 条纹相机使用分压器2静态测试图像<br/>Fig.5 The static experiment image of streak camera under voltage divider 2

图5 条纹相机使用分压器2静态测试图像
Fig.5 The static experiment image of streak camera under voltage divider 2

表3 条纹相机分压器2测试结果<br/>Table 3 Streak camera experimental results under voltage divider 2

表3 条纹相机分压器2测试结果
Table 3 Streak camera experimental results under voltage divider 2

图6 条纹变像管电子聚焦透镜焦距变化<br/>Fig.6 The focal length change of electronic focus lens of streak tube

图6 条纹变像管电子聚焦透镜焦距变化
Fig.6 The focal length change of electronic focus lens of streak tube

图7 条纹相机MTF<br/>Fig.7 The MTF of streak camera

图7 条纹相机MTF
Fig.7 The MTF of streak camera

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备注

引言

1 条纹变像管设计

2 分压电路影响与相机测试

3 理论分析

4 结语

期刊信息

备注

引言

1 条纹变像管设计

2 分压电路影响与相机测试

3 理论分析

4 结 语

期刊信息

4 结语