脉冲展宽技术能够有效提升分幅变像管的时间性能,但脉冲晃动引起的曝光时间抖动则使像管可靠性降低。为探讨曝光时间抖动的成因和改善方法,对曝光时间进行测试、误差分析和修正。通过对200幅动态图像进行分析,结果显示脉冲晃动和展宽斜率非一致性引起曝光时间的抖动范围为11~26 ps,根据展宽脉冲的特点和曝光时间的分布比例,采用加权均值法获得像管曝光时间评估值为~17.3 ps;采用展宽脉冲初始幅值修正同步电压,使曝光时间测量值与理论值之间的偏差从~9.8%降低到~1.7%,有效地提升了测量值的可信度。研究结果为像管曝光时间可靠性的提升提供了理论指导和技术支持。

The temporal performance of framing tube can be effectively promoted by pulse-dilation technology. However, the pulse jitter causes the exposure time jitter, which reduces the reliability of the tube. In order to discuss the reason and the improvement method of the exposure time jitter, the measurement, errors analysis and modification of exposure time are carried out. The results of the analysis of 200 dynamic images show that the jitter scope of the exposure time, caused by pulse jitter and inconsistency of dilation slope, is in the range of 11-26 ps. And the evaluation value of the exposure time of the tube is about 17.3 ps by using weighted means method according to the characteristics of dilation pulse and the distribution ratio of exposure time. Using the initial amplitude of the stretching pulse to correct the synchronization voltage, the deviation between the measurement value of the exposure time measurement and the theoretical value is reduced from ~9.8% to ~1.7%, which effectively increases the credibility of the measurement value. The study results provide the theoretical reference and technical support for the improvement of the reliability of the exposure time of the tube.