基于电容充放电原理的纳秒级时间精度测量技术  

Nanosecond Time Precision Measurement Technology Based on the Principle of Capacitor Charging and Discharging

作　　者：王刚[1] 李桂林[1] 

机构地区：[1]大连交通大学电气信息学院,辽宁大连116028

出　　处：《化工自动化及仪表》2010年第8期69-71,共3页Control and Instruments in Chemical Industry

摘　　要：在电子电路中要精确测量一个很小的时间间隔,很难实现精度达到纳秒级。目前在自动控制系统中所使用的单片机,由于其工作频率的限制,其分辨率最小也在一个时钟周期的量级,而且误差也较大。本文旨在提出一种利用电容充电和放电的原理,计算出不足一个时钟周期的时间间隔,并结合对时钟周期的计数数目,测量两个脉冲之间的时间间隔,在不影响测量时间最大间隔的前提下,使其精度达到纳秒级。It is very difficult to achieve nanosecond accuracy to accurately measure a very small time interval in the electronic circuit.Because of the limits of operating frequency constraints,the minimum resolution of the MCU currently used in the automatic control system is also the order of one clock cycle,and the errors are larger.The time interval,which less than one clock cycle,was calculated by using the principle of capacitor charging and discharging.The time interval between two pulses was measured by combining with the count of the number of clock cycles.Under the premise of the largest interval of time without affecting the measurement,the accuracy can reach nanosecond.

关 键 词：电容充放电 纳秒级时间测量 精密时间测量 

分 类 号：TM935[电气工程—电力电子与电力传动]