背景光作用下脉冲激光测距仪的设计

Design of pulsed laser rangefinder under background light noise

针对光电探测器受环境背景光干扰导致脉冲式激光测距仪测量精度下降的问题,结合激光测距系统的应用环境,构建背景光干扰下光电探测器的探测模型,分析了背景光引起的干扰对探测系统的影响。在此基础上,分别在发射、接收、光学部分进行有针对性的选型设计,从而达到抑制噪声光功率的效果。同时还提出了一种简化发射时刻鉴别电路的新方法,不仅缩小了电路结构,且易于实现。实验证明,系统在满足设计要求的条件下能有效的避免背景光的干扰,提高了系统的稳定性,且精度<5cm。

The measurement accuracy of the pulsed laser rangefinder is decreased due to the background light interference of the photodetector. Combined with the application environment of laser ranging system, a model of photodetector under background light is founded, and the influence of background light interference on the detection system is also analyzed. Based on that, the part of the launch, receiving, optical was targeted designed respectively to achieve effects of back- ground suppression. Also, a new method is also proposed to simplify the launching time discrimination circuit, which not only reduces the circuit structure, but also easy to implement. The result show that, the system can effectively avoid the interference of the background light and improve the stability of the system under the condition of meeting the design re- quirements, and its ranging accuracy is 〈5 cm.