一种改进的脉冲式激光测距仪的设计

脉冲式激光测距仪原理简单,集成化和小型化比较好,采用直接计数激光脉冲延迟时间方法测量距离,精度比较低。本文采用高精度电容的大充放电时间常数比的方法,将待测的微小时间放大,采用较低的时钟精确测量激光脉冲回波与主计数时钟之间小于一个周期的时间间隔,提高了脉冲式激光测距仪的测量精度。本文给出了系统设计框图,实验数据表明,此系统和普通脉冲式激光测距仪相比,距离分辨率提高了20倍。

Design of improved impulse laser range finder

Impulse laser range finder has a simple theory,good integration and miniaturization.But it has the bad precision.This article uses the stimulant technique to zoom in capacitance's charging and discharging time.So the duration between the echo and the counting clock could be measured by the low frequency clock,which is less than 1 clock cycle.At last,it designs a system that could largely improve the precision of measure.The experiment result shows that the range resolving power is equal to 30 times of simple Impulse laser range finder.