基于二分束的三角法激光测距研究

Triangle method of laser range finding based on two-section beam technology

为了实现激光测距仪小型化和低成本制作,提出了一种新型的基于高斯光束二分束的三角法激光测距方法,采用双PIN管探测器来替代传统三角法激光测距系统中的CCD或PSD光电检测单元,实现光束的二分束;利用光度学和高斯光束理论,推导出两分束的光功率比与待测距离及发射角的关系,并通过数值计算获得其关系图,进而通过测量分束比计算出目标距离。试验结果表明,本方法具有结构简单、精度高、对目标物颜色深浅不敏感等优越特性,并具有良好的应用前景。

Aiming at realizing the fabrication of miniaturized laser range finder with low cost,a new triangle method for laser range finding based on the two-section Gaussian beam was proposed.Double PIN photodiode was used to acquire two section beams,replacing CCD or PSD for traditional triangle method in laser range finder.The relationships among the power ratio of two section beams,the corresponding range and the emission angle were derived from the photometry and Gaussian beam theory.Some figures for the above relations were plotted by using numerical methods,and the range to the target could be calculated from the measured power ratio.The test results indicate that this method is possessed of the merits of simple structure,high resolution and less sensitive to the darkness of the target object.