基于差分光路的脉冲激光测距实验研究

摘要

为降低背景噪声对测距精度影响，提出一种基于双通道的差分光路测距方法。该方法采用双探测器接收回波信号，在最佳位置进行回波差分，将峰值时刻鉴别转化为过零点鉴别，有效抑制了背景噪声及脉宽展宽对测距性能的影响。通过搭建差分光路测距系统，针对50 m处的漫反射目标对比测距实验误差，实验结果表明：在有背景噪声的情况下，相比较传统单光路测距方法，采用差分光路将测距误差均方根由95 mm 降至70 mm。同时，验证了当差分距离为光速与回波脉宽的乘积时，可获得最高的探测灵敏度。%In order to decrease the effects of background noise on ranging accuracy,a ranging method based on differenti-al optical-path was proposed.Two receivers were adopted to receive echo signal,and peak discriminator was transformed into zero-crossing discriminator when two receivers were in the best position,which can efficiently suppress the effects of background noise and pulse width broadening on the ranging performance.The differential optical-path ranging system is built,and comparative ranging experiments are carried out for diffuse reflection target at 50 m.The experimental results show that the proposed method can make the root-mean-square of ranging error decrease from 95 mm to 70 mm under the condition of background noise comparing with traditional single optical path ranging method.Meanwhile,the highest sen-sitivity is obtained when differential distance is multiply by light speed and pulse width.