基于双探测器的手持式激光测距仪系统设计与实现  

System design and implementation for a portable laser rangefinder with dual detectors

作　　者：赵文成[1] 许贤泽[1] 乐意[1] 刘盼盼[1] 汪鑫[1] 

机构地区：[1]武汉大学电子信息学院,湖北武汉430079

出　　处：《中南大学学报（自然科学版）》2015年第8期2843-2849,共7页Journal of Central South University:Science and Technology

基　　金：国家重点基础研究发展计划(973计划)项目(2011CB707904);武汉市科技局应用基础研究计划项目(2013010501010121)~~

摘　　要：针对传统激光测距仪测距精度低、成本高以及速度慢等问题,设计一种基于双探测器的手持式激光测距仪。该测距仪使用分束镜实现光路内校准,设计检相电路将信号相位转变为带有相位信息的直流电平,并使用CORDIC数字计算方法求解相位,最后应用基于超定方程组的测距解模糊算法求解待测距离,对3台双探测器测距仪和2台K60测距仪以精度0.18 mm进行测距比较试验。研究结果表明：与传统测距仪相比,光路内校准可以消除电路附加相移,检相算法简单快速,解模糊避免对最优距离的搜索,因此提高了测距精度和测距速度。在0-60 m的测程内,3台双探测器测距仪的平均测距时间小于1.8 s,平均测量误差小于2 mm,测量标准差小于1 mm。与K60系列测距仪相比,双探测器测距仪测距精度和测距速度都有较大提升,验证了该设计方案的可靠性。The traditional laser rangefinders have low measurement accuracy, slow speed and high cost. Owing to this, a portable laser rangefinder with dual detectors was designed. Firstly, a beam splitting lens was used to allow the light path to realize internal calibration. And then a phase detecting circuit was designed to produce a DC level, which reflects the value of the signal phase. CORDIC algorithm was adopted to calculate phase. Finally, based on overdetermined linear equations, an algorithm was presented to solve the laser ranging ambiguity. Two K60 laser rangefinder and three proposed rangefinders were experimented on the national standard baseline with the precision of 0.18 mm. The experimental results show that the extra phase-shifting can be removed by internal calibration. The calculation in phase-detection is simple and fast and the search of optimal solution in laser ranging ambiguity can be avoided. The proposed rangefinder has higher measurement accuracy and speed in comparison with the traditional ones. The measurement time is less than 1.8 s, the average measurement error of those three prototypes is less than 2 mm, and the standard deviation is less than 1 mm within the measuring range of 0-60 m. Compared with K60 laser rangefinder, the proposed rangefinders have higher measurement accuracy and speed, which indicates the high reliability of the proposed system design scheme.

关 键 词：手持式激光测距仪 相位测量 距离解模糊 分束镜 检相电路 CORDIC数字算法 

分 类 号：TH761.2[机械工程—仪器科学与技术]