Signal processing for confocal probe based on time difference

QIU Zu-rong; WEI Fang-kun; XIE Li-qin; LI Xing-hua; XIAO Gong-jian

doi:10.3788/OPE.20101809.2109

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Signal processing for confocal probe based on time difference

Article | 更新时间：2020-08-12

- Signal processing for confocal probe based on time difference
- Optics and Precision Engineering Vol. 18, Issue 9, Pages: 2109-2115(2010)
- 作者机构：
  
  1. 天津大学精密测试技术及仪器国家重点实验室天津,300072
  2. 泰格林纸集团(永州) 湘江纸业有限责任公司,湖南永州,425000
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20101809.2109
  CLC： TB92;TP274
- Received：25 November 2009，
  
  Revised：12 March 2010，
  
  Published Online：29 September 2010，
  
  Published：20 September 2010
- 稿件说明：
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裘祖荣, 魏芳坤, 谢利勤, 李杏华, 肖功剑. 基于时间差法的共焦测头信号处理[J]. 光学精密工程, 2010,18(9): 2109-2115

QIU Zu-rong, WEI Fang-kun, XIE Li-qin, LI Xing-hua, XIAO Gong-jian. Signal processing for confocal probe based on time difference[J]. 光学精密工程, 2010,18(9): 2109-2115
裘祖荣, 魏芳坤, 谢利勤, 李杏华, 肖功剑. 基于时间差法的共焦测头信号处理[J]. 光学精密工程, 2010,18(9): 2109-2115 DOI： 10.3788/OPE.20101809.2109.

QIU Zu-rong, WEI Fang-kun, XIE Li-qin, LI Xing-hua, XIAO Gong-jian. Signal processing for confocal probe based on time difference[J]. 光学精密工程, 2010,18(9): 2109-2115 DOI： 10.3788/OPE.20101809.2109.

摘要

基于时间差法的共焦测头测量的位移量是测头输出的光电信号中相邻驼峰之间对应时间差的一一映射。为了更加准确稳定地计算出光电信号中的时间差

本文分析了改进后测头输出光电信号的特点

指出了目前信号处理方法的缺陷

进而提出了相似形态分析法

用于计算相邻驼峰之间对应的时间间隔。实验数据显示

在采样频率为2 MHz的数据采集系统中

使用相似形态分析法计算得到的时间间隔的标准差为0.33 s

高于最大值法的3.37 s。结果表明

相似形态分析法计算结果准确

不受噪声的影响

对信号的前期处理要求低

易于实现

计算结果稳定且不受激光光强变动的影响和环境光的干扰。

Abstract

The displacement measured by a confocal probe based on time difference method is an one-to-one mapping to the time difference between the two peaks in a photo-electric signal. In order to calculate the time difference accurately

the characteristics of photo-electric signal output from an improved probe was analyzed and then the defects in the current signal processing method were pointed out.A processing method named similar pattern analysis was persented to calculate the time interval between the two peaks. Experimental data show that in the data acquisition system with sampling frequency of 2 MHz

the standard deviation of time difference by using the similar pattern analysis is 0.33 s

which is better than 3.37 s by using the maximum value method. With the similar pattern analysis

it is easy to implement the signal pre-processing. The calculated results are accurate and stable and are not influenced by the changes of laser intensity and ambient light interference.

关键词

Keywords

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