摘要
ps级的飞行时间测量是保证超声流量测量、激光测距等技术测量精度的关键。该文研究了脉冲计数法和时幅变换法相结合的飞行时间测量方法,并设计了时幅变换内插飞行时间测量系统。该系统能够在大动态范围下实现对飞行时间的精确测量。首先利用射极耦合逻辑芯片搭建高速同步电路,实现对飞行时间的粗精细分,而后通过时幅变换电路,将微小时间间隔转换为电压进行测定。基于细分时间间隔的分布规律,提出了双路时幅变换单元联合校正的方法,采用单一时间基准实现对两路时幅变换单元的同时标定。利用搭建的标准时间间隔发生装置,对飞行时间测量系统进行了标定和测试。实验表明,该系统具有良好的线性度和稳定度,测时分辨率可达2.6ps,单次测量精度优于50ps。
Picosecond resolution time of flight measurements is required to ensure the precision of ultrasonic flow meters, laser radars and other devices. A time of flight （TOF）＂measurement method combining pulse counting and time-to-amplitude conversion （TAC） was developed to give accurate measurements over a large dynamic range using time-to-amplitude conversion interpolation. A synchronizing circuit was constructed with emitter couple logic devices to realize coarse and fine divisions of the TOF. The subdivided TOF was then converted to a voltage in a TAC circuit. A simultaneous calibration method was developed to correct two TACs with a single time reference according to the distribution regularity of the subdivided time intervals. Calibrations of the time of flight measurement system were performed using a standard time interval generator. The results show that the system has good linearity and stability with a measurement resolution of 2.6 ps and a single-shot precision of better than 50 ps.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第10期1412-1417,共6页
Journal of Tsinghua University(Science and Technology)
基金
清华大学精密测试技术及仪器国家重点实验室自主研究项目
关键词
飞行时间测量
时幅变换
脉冲计数
模拟内插
time of flight measurement
time-to-amplitude conversion~ pulse counting
analog interpolation
