Spot modification in laser triangulation displacement measurement

ZHANG Zheng-qi; TAO Wei; YANG Hong-wei; MAO Yi-mei; ZHAO Hui

doi:10.3788/OPE.20162413.0057

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Spot modification in laser triangulation displacement measurement

更新时间：2020-08-13

- Spot modification in laser triangulation displacement measurement
- Optics and Precision Engineering Vol. 24, Issue 10s, Pages: 57-65(2016)
- 作者机构：
  
  上海交通大学电子信息与电气工程学院上海,200240
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20162413.0057
  CLC： TP212.12;TH744.5
- Received：28 May 2016，
  
  Revised：12 June 2016，
  
  Published：14 November 2016
- 稿件说明：
移动端阅览
张正琦, 陶卫, 杨红伟等. 激光三角测距中的光斑形状修正[J]. 光学精密工程, 2016,24(10s): 57-65

ZHANG Zheng-qi, TAO Wei, YANG Hong-wei etc. Spot modification in laser triangulation displacement measurement[J]. Editorial Office of Optics and Precision Engineering, 2016,24(10s): 57-65
张正琦, 陶卫, 杨红伟等. 激光三角测距中的光斑形状修正[J]. 光学精密工程, 2016,24(10s): 57-65 DOI： 10.3788/OPE.20162413.0057.

ZHANG Zheng-qi, TAO Wei, YANG Hong-wei etc. Spot modification in laser triangulation displacement measurement[J]. Editorial Office of Optics and Precision Engineering, 2016,24(10s): 57-65 DOI： 10.3788/OPE.20162413.0057.

摘要

分析了激光三角测距中成像光斑形状不对称的产生原因，采用光学系统建模的方法对光斑形状进行了有效的修正。应用Zemax软件对系统光学部分进行模拟仿真，得到漫反射光斑的最小像差成像点。在建立的三维空间坐标系中利用成像点坐标数据建立一个虚拟光学成像系统模型，应用光线追迹的方法得到实际光学成像系统与虚拟光学成像模型中像元光强的转换关系从而得到相应的修正系数。然后，用修正系数对光斑采样数据进行修正后通过质心法求出光斑中心。实验表明，应用该方法可将外界环境变化带来的光斑中心定位重复性误差减小至原来的50%，测距系统整体的非线性误差达到0.125%。该方法在基本不改变测距系统测量速度的前提下，有效的减小了外界环境变化带来的误差，提高了系统的稳定性和抗干扰能力。

Abstract

The mechanism of the dissymmetric light spot shape in the laser triangulation was analyzed

and the mass center of the spot was corrected effectively by optical system modeling. Firstly

Zemax software was used for analog simulation of the optical system to acquire the minimum aberration imaging point of diffuse reflection spot. Secondly

a virtual optical imaging system model was established according to the coordinate data of imaging points in the built three dimensional space coordinate system

thus the transformation formulas of pixel intensities between actual optical imaging system and virtual optical imaging model were deduced through ray tracing for calculation of the corresponding correction coefficient. Finally

the light spot center was obtained by centroid method after the sampling data of light spot was corrected by the calculated coefficients. Experiment result indicates that this method can decrease the repeatability error of light spot center positioning caused by the external environment to 50% of the original one

with the overall non-linear error of ranging system reaches 0.125%. The proposed method can effectively decreased the error caused by external environment change and improved stability and anti-disturbance capacity without basic change of the measuring speed of ranging system.

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references

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