Thickness measurement of rotary parts with double laser under unknown relative position condition

Jia-fu LI; Xiao-lin ZHANG; Jun WANG

doi:10.3788/OPE.20172509.2300

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Thickness measurement of rotary parts with double laser under unknown relative position condition

Modern Applied Optics | 更新时间：2020-08-13

- Thickness measurement of rotary parts with double laser under unknown relative position condition
- Optics and Precision Engineering Vol. 25, Issue 9, Pages: 2300-2308(2017)
- 作者机构：
  
  哈尔滨工业大学电气及自动化学院, 黑龙江哈尔滨 150001
- 作者简介：
  
  WANG Jun, E-mail:wang_jun@hit.edu.cn
- 基金信息：
- DOI：10.3788/OPE.20172509.2300
  CLC： TH741;TN247
- Received：04 January 2017，
  
  Accepted：24 February 2017，
  
  Published：25 September 2017
- 稿件说明：
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Jia-fu LI, Xiao-lin ZHANG, Jun WANG. Thickness measurement of rotary parts with double laser under unknown relative position condition[J]. Optics and precision engineering, 2017, 25(9): 2300-2308.
DOI：

Jia-fu LI, Xiao-lin ZHANG, Jun WANG. Thickness measurement of rotary parts with double laser under unknown relative position condition[J]. Optics and precision engineering, 2017, 25(9): 2300-2308. DOI： 10.3788/OPE.20172509.2300.

摘要

为了实现对大型空心回转体厚度的测量

提出了一种基于双激光位移传感器的非接触扫描检测方法。在回转体与双激光位移传感器相对位置未知的条件下

分析了由回转体安装偏心以及传感器光轴与原点不共线时所引入的测量误差

建立了双传感器信号与被测位置厚度之间的数学模型。并借助于相关理论相位差计算法、牛顿迭代法以及循环平移方法

将实际厚度值从传感器信号中提取出来。对回转体厚度检测算法的仿真实验表明

当检测信号中干扰分量的幅值不大于0.3 mm时

算法检测厚度的相对误差总体保持在0.5%以内

并将此作为调整旋转台转速的依据。分析实验测量数据发现

两路信号的最大相对平移量为4；通过对数据进行偏心补偿以及平移

本厚度检测算法的测量重复性误差不大于0.05 mm

可以实现在随机位置状态下对回转体厚度的高精度检测。

Abstract

In order to measure the thickness of large-sized hollow rotating parts

a non-contact measuring method based on double laser displacement sensors was proposed. With unknown relative position between rotating parts and the double laser displacement sensor

the measuring errors induced by the installed eccentricity of rotating pieces as well as the non-collinear relationship between dual-sensor optic axis and the origin were analyzed. Meanwhile

mathematical model between dual-sensor signals and the thickness of the measured surface position was deduced. Thereby

the actual thickness value can be extracted from the sensor signals with the aids of the phase difference measurement based on correlation theory

Newton iterative method and the circulation translation method. Through the simulating experiment for the thickness detection algorithm of the rotary body

it is indicated that the relative detection error remains within 0.5% when the amplitude of the interference component in the detected signal is no greater than 0.3mm

which can be used as a reference for rotating speed adjustment of the turntable. The analysis on the experimental measurement data shows that the maximum relative translation of two detection signals is 4; with eccentricity compensation and cycle-spinning of the data

the measurement repeatability error of the thickness detection algorithm is less than 0.05 mm

which meets the detection precision requirement large-sized hollow rotating parts in any position.

关键词

Keywords

references

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