一种双臂激光测距系统设计和误差分析

Design and error analysis of a two-arm laser ranging system

长度是7个基本物理量之一,在人们工作和生活中有着广泛的应用场景。本文提出了一种由两个激光测距传感器构成的双臂激光测距系统,可以通过非接触方式测量仪器与空间中任意一点以及空间中任意两点之间的距离,还具备测量阴角、阳角和二维垂直度的功能。本系统测量误差从理论上被分析,并通过MATLAB软件进行了仿真。实际的实验测试表明,测量距离在1 m以内时绝对误差能控制在1 mm以内,测量距离在50 m以内时相对误差能控制在1‰的数量级。同时,重复性测量实验和测量不确定度评定验证了本系统的误差指标,也为本系统的改进指明了方向。本仪器还具有功耗低、成本低和便于便携化等优势,因此有着广阔的应用前景。

Length is one of the seven basic physical quantities,which is widely used in people′s work and life.In this paper,a two-arm laser ranging system composed of two laser ranging sensors is proposed.It can measure the distance between the instrument and any point in space and between any two points in space in a non-contact way.It also has the function of measuring internal angle,external angle and two-dimensional perpendicularity.The measurement error of the system is analyzed theoretically and simulated by MATLAB software.The actual experimental test shows that the absolute error can be controlled within 1 mm when the measurement distance is less than 1 m,and the relative error can be controlled within the order of 1‰when the measurement distance is less than 50 m.And the repeatability measurement experiment and measurement uncertainty evaluation verify the error index of the system,and point out the direction for the system improvement.The instrument also has the advantages of low power consumption,low cost and easy portability,so it has broad application prospects.