基于延时复用技术的短时间间隔测量方法

Short Time Interval Measurement Method Based on Delay-Time Multiplexing Technique

提出了一种基于延时复用技术的新的短时间间隔测量方法.根据基于时-空关系的时间间隔测量原理,将若干延时单元组成延迟链.延迟链的输出被反馈到系统输入端并与输入信号进行单稳态触发逻辑判断,判断结果被重新送回到重合检测电路中去,实现一个延迟链可以多次重复使用的循环检测,扩展了基于时-空关系的时间间隔测量范围,提高了测量系统的稳定性.实验和分析结果表明了该方法的科学性和先进性,其测量分辨率可达到100皮秒至10皮秒量级.结合现场可编程门阵列(FPGA)片上技术,新方案设计的测量系统具有结构简单、成本低廉的优点.

A new short time interval measurement method based on delay-time multiplexing technique has been proposed. According to the time interval measurement principle based on time-space relationship,a delay chain was composed of several delay-time units. Output of the delay chain was fed back to the system input end and judged by monostability trigger logic with the original input signal. The result of the judgement was sent back to the coincidence detection circuit to realize repeated cycle detection of a delay chain. Therefore,the range of time interval measurement based on time-space relationship is expanded and the stability of the measurement system is improved. Experiment and analysis results show that the method is scientific and advanced,with measurement resolution from hundred picoseconds to ten picoseconds. Combined with field- programmable gate array （FPGA） on-chip technique,the new measurement method has the advantages of simple structure and low cost.