设计了一种高精度、高线性度、轻小型激光脉冲飞行时间测量模块。结合TDC7201芯片在时间测量方面的优势, 将其作为时间测量核心部分, 并将STM32F103RET6微控制器作为主控芯片来控制整个模块的工作。实验结果表明, 该模块在12 ns~100 s时间间隔范围内的时间测量精度最高可达4.1 ps; 测量结果的线性拟合相关系数为1, 且能够测量激光脉冲主波与5个回波之间的时间间隔。该模块可满足基于硅光电倍增管(Silicon Photomultiplier, SiPM)的脉冲式激光测距系统的高精度、高线性度、多回波、轻量化等实际应用需求。

A high precision, high linearity, light and small module for measuring time of flight of laser pulses is designed. Because the TDC7201 chip has advantages in time measurement, it is used as the core for time measurement. The STM32F103RET6 microcontroller is used as the main control chip for controlling the whole module. The experimental results show that the module has its time measurement accuracy up to 4.1 ps in the time interval range from 12 ns to 100 s. The linear fitting correlation coefficient of the measurement result is 1. It can measure the time intervals between the main laser pulse and five echoes. This module can meet the practical application requirements of high precision, high linearity, multi-echo and lightweight of the pulsed laser ranging systems based on SiPM.