基于时间数字转换器的高精度测速系统  

High Precision Velocity Measurement System Based on Time-To-Digital Converter

作　　者：戴羿隆 陈凯 吴光[1] 贾梦辉 邓伦华[1] 张三军[1] Dai Yilong;Chen Kai;Wu Guang;Jia Menghui;Deng Lunhua;Zhang Sanjun(State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai 200241,China;Materials Characterization Center,ECNU Multifunctional Platform for Innovation,East China Normal University,Shanghai 200241,China)

机构地区：[1]华东师范大学精密光谱科学与技术国家重点实验室,上海200241 [2]华东师范大学公共创新服务平台物质表征中心,上海200241

出　　处：《激光与光电子学进展》2025年第1期175-182,共8页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(12174114,21827814);上海市科技创新行动计划(22520712500)。

摘　　要：光幕式弹丸测速系统被广泛应用于飞行物速度测量和武器测试领域,但其测速精度很大程度上受到系统计时精度的限制。提出并搭建基于现场可编程门阵列和多相位时钟法时间数字转换器的光幕式弹丸测速系统,其计时分辨率达到312.5 ps,计时精度为125.6 ps,最大计时量程达1.342 s。同时,针对现有光幕测速系统模拟测试方案采样少、响应慢的局限,基于皮秒脉冲激光器,设计了高速响应的模拟测试方案,所提测速系统的时间测量精度优于85 ns。当弹丸速度为1000 m/s时,测速系统的理论测速精度可达0.085‰。此外,通过弹丸射击测试对所提系统进行了检验。结果表明,该系统结构简单、成本较低、计时精度高,并且具备高度可拓展性,为提升光幕测速系统的测量精度提供了一种可行的方案。The light screen projectile velocity measurement system is widely used in the field of flying object velocity measurement and weapon testing,but its velocity measurement accuracy is largely limited by the timing accuracy of the system.This paper proposes and builds an light screen projectile velocity measurement system based on field programmable gate array and multi-phase clock time-to-digital converter.Its timing resolution reaches 312.5 ps,timing accuracy reaches 125.6 ps,and the maximum timing range reaches 1.342 s.At the same time,in view of the limitations of the existing simulation test scheme of light screen velocity measurement system with less sampling and slow response,this paper designs a simulation test scheme of high speed response based on picosecond pulse laser,and obtains that the time measurement accuracy of this velocity measurement system is better than 85 ns.When the projectile velocity is 1000 m/s,the theoretical measurement accuracy of the velocity measurement system can reach 0.085‰.In addition,the working state of the system is verified by the projectile firing test.The results show that the system has simple structure,low cost,high timing accuracy,and high scalability,which provides a feasible scheme for improving the measurement accuracy of the light screen velocity measurement system.

关 键 词：光幕测速 多相位时钟 现场可编程门阵列 时间数字转换器 

分 类 号：TN29[电子电信—物理电子学]