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混凝土测试中光强对数字图像相关测量精度的影响研究

杨登辉 黄晨 樊平 吕健 韦鹏 杨立云

杨登辉, 黄晨, 樊平, 吕健, 韦鹏, 杨立云. 混凝土测试中光强对数字图像相关测量精度的影响研究[J]. 矿业科学学报, 2023, 8(5): 677-687. doi: 10.19606/j.cnki.jmst.2023.05.009
引用本文: 杨登辉, 黄晨, 樊平, 吕健, 韦鹏, 杨立云. 混凝土测试中光强对数字图像相关测量精度的影响研究[J]. 矿业科学学报, 2023, 8(5): 677-687. doi: 10.19606/j.cnki.jmst.2023.05.009
Yang Denghui, Huang Chen, Fan Ping, Lü Jian, Wei Peng, Yang Liyun. Research on the influence of light intensity on digital image correlation measurement accuracy in the testing of concrete[J]. Journal of Mining Science and Technology, 2023, 8(5): 677-687. doi: 10.19606/j.cnki.jmst.2023.05.009
Citation: Yang Denghui, Huang Chen, Fan Ping, Lü Jian, Wei Peng, Yang Liyun. Research on the influence of light intensity on digital image correlation measurement accuracy in the testing of concrete[J]. Journal of Mining Science and Technology, 2023, 8(5): 677-687. doi: 10.19606/j.cnki.jmst.2023.05.009

混凝土测试中光强对数字图像相关测量精度的影响研究

doi: 10.19606/j.cnki.jmst.2023.05.009
基金项目: 

中央高校基本科研业务费 2022JCCXLJ01

中央高校基本科研业务费 2022YJSLJ04

旧桥检测与加固交通行业重点实验室(北京)开放课题 2020-JQKFKT-5

详细信息
    作者简介:

    杨登辉(1997— ),男,河南驻马店人,硕士研究生,主要从事数字图像相关技术测量方面的研究工作。Tel:13298388923,E-mail:ydh2422163520@163.com

  • 中图分类号: O348.1

Research on the influence of light intensity on digital image correlation measurement accuracy in the testing of concrete

  • 摘要: 在复杂光照条件下采用数字图像相关技术(DIC)测量混凝土结构表面应变场时,光强变化会引起图像的退相关效应。针对此问题,基于传统2D-DIC测量系统,探究了光强变化对DIC测量精度与计算效率的影响规律。试验结果表明:平均灰度190为最优光强;以最优光强下的图片作为参考图像,光强增大时应变误差呈指数增长,光强减小时应变误差呈线性增长;计算时间与计算点匹配率对光强的小范围波动不敏感,但光强的剧烈变化会导致计算时间增加1~3倍以及25 % 的计算点匹配失败。结合图像质量评估指标,验证了实验结果的准确性。为了获得高质量的图像,本文建立了绿光带通滤波成像系统,该系统在外界环境光剧烈变化条件下依然能够保持图像的亮度与对比度基本不变,应变误差与计算效率均接近于最优光强。相对于传统2D-DIC测量系统,绿光带通滤波成像系统可较好地应用到室外环境测量。
  • 图  1  DIC的测量原理

    Figure  1.  The principle of DIC measurement

    图  2  传统2D-DIC测量系统

    Figure  2.  The traditional 2D-DIC measurement system

    图  3  3种光照强度下的散斑图像

    Figure  3.  Speckle patterns of three kinds of light intensity

    图  4  基于平均灰度的光强参数表征流程

    Figure  4.  The flow of light intensity parameter representation based on average gray

    图  5  不同光强下x方向的应变误差云图

    Figure  5.  The strain error nephogram in x direction with different light intensity

    图  6  不同光强下xyxy方向上的应变测量误差与计算效率

    Figure  6.  The strain measuring error in x, y and xy direction and calculation efficiency with different light intensity

    图  7  光强剧烈波动时x方向的应变误差云图

    Figure  7.  Strain error nephogram in x direction when light intensity fluctuates violently

    图  8  光强波动时xyxy方向上的应变测量误差与计算效率

    Figure  8.  The strain measuring error in x, y and xy direction and calculation efficiency of light intensity fluctuation

    图  9  平均灰度梯度随光强变化的曲线

    Figure  9.  The curve of average gray gradient varying with different light intensity

    图  10  绿光带通滤波成像系统

    Figure  10.  The green band-pass filter imaging system

    图  11  光学带通滤波片的透射光谱曲线及实物

    Figure  11.  Transmission spectrum curve and picture of the optical band-pass filter

    图  12  Prosilica GT3400相机量子效率曲线

    Figure  12.  Quantum efficiency curve of Prosilica GT3400 camera

    图  13  外界环境光变化时的散斑图像

    Figure  13.  Speckle patterns when external ambient light changes

    图  14  光强变化时传统2D-DIC测量系统与绿光带通滤波成像系统x方向的应变误差云图

    Figure  14.  Strain error nephogram in x direction between traditional 2D-DIC measurement system and green band-pass filter imaging system when light intensity changes

    表  1  光强变化时传统2D-DIC测量系统与绿光带通滤波成像系统应变场测量误差

    Table  1.   Comparison of strain measuring error between traditional 2D-DIC measurement system and green band-pass filter imaging system when light intensity changes

    应变测量误差 低照度 最优光强 高照度
    传统2D-DIC测量系统 绿光带通滤波成像系统 传统2D-DIC测量系统 绿光带通滤波成像系统 传统2D-DIC测量系统 绿光带通滤波成像系统
    x方向应变测量误差/ 10-6 66 63 25 45 58 993 79
    y方向应变测量误差/ 10-6 56 44 22 21 57 894 68
    xy方向应变测量误差/ 10-6 44 44 19 21 23 583 49
    下载: 导出CSV

    表  2  光强变化时传统2D-DIC测量系统与绿光带通滤波成像系统所采集的图像质量

    Table  2.   Comparison of the quality of the pattern collected by traditional 2D-DIC measurement system and the green band-pass filter imaging system when light intensity changes

    图像质量 低照度 最优光强 高照度
    传统2D-DIC测量系统 绿光带通滤波成像系统 传统2D-DIC测量系统 绿光带通滤波成像系统 传统2D-DIC测量系统 绿光带通滤波成像系统
    平均灰度 20.89 173.59 190.41 192.77 254.78 208.59
    平均灰度梯度 3.21 39.48 27.76 39.85 0.3 37.42
    下载: 导出CSV

    表  3  光强变化时传统2D-DIC测量系统与绿光带通滤波成像系统的计算效率

    Table  3.   Comparison of the efficiency of calculation between traditional 2D-DIC measurement system and green band-pass filter imaging system when light intensity changes

    计算效率 低照度 最优光强 高照度
    传统2D-DIC测量系统 绿光带通滤波成像系统 传统2D-DIC测量系统 绿光带通滤波成像系统 传统2D-DIC测量系统 绿光带通滤波成像系统
    计算时间/ s 0.297 0.125 0.124 0.125 0.488 0.126
    计算点匹配率/% 100 100 100 100 75 100
    下载: 导出CSV
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  • 收稿日期:  2023-01-04
  • 修回日期:  2023-05-17
  • 刊出日期:  2023-10-31

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