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Traceable technique for an in situ full field in-plane measurement validation of digital image correlation

机译：用于数字图像相关性的现场全场平面测量验证的可追溯技术

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摘要

For digital image correlation to be firmly accepted as a validated displacement measurement system in the industrial arena, a measurement must be captured by the analysis system at time of test which confirms that the image correlation hardware and software system is performing as expected. To this end, a method for validating stereo digital image correlation optical test setups is presented, which is traceable to the length stan-dard. The method employs a screen, on which is displayed a randomized speckle pattern of appropriate pitch for the test in question. This speckle pattern is then artificially translated by a known number of pixels on the screen, and image pairs captured of the original and translated speckles. Processing of these data image pairs with image correlation, and calibration of the pixel pitch of the display screen using a traceable measurement system, allows the image correlation test setup to be traceably calibrated in terms of in-plane displacement. The method is shown to be sufficiently sensitive and repeatable to provide a reasonably accurate, traceable validation in a Dractical environment.
机译：为了将数字图像相关性牢固地接受为工业领域中经过验证的位移测量系统，必须在测试时由分析系统捕获一个测量值，以确认图像相关性硬件和软件系统是否按预期运行。为此，提出了一种用于验证立体数字图像相关光学测试装置的方法，该方法可追溯至标准长度。该方法采用屏幕，在该屏幕上显示针对所讨论的测试的具有适当间距的随机散斑图案。然后，通过屏幕上的已知数量的像素人工翻译此斑点图案，并捕获原始斑点和已翻译斑点的图像对。这些具有图像相关性的数据图像对的处理，以及使用可追溯测量系统对显示屏像素间距的校准，使得可以根据面内位移对图像相关性测试设置进行可追溯性的校准。该方法显示出足够的灵敏度和可重复性，可以在Dractical环境中提供合理准确，可追溯的验证。

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  • 来源
    《Optical engineering》 |2017年第3期|033101.1-033101.8|共8页
  • 作者

    Eszter Szigeti; Matthew Loparco; Evgeni Todorov; Shelby Wheatley; Richard J. Greene;

  • 作者单位

    Airbus Operations Ltd., UK, Filton, Bristol, United Kingdom;

    Airbus Operations Ltd., UK, Filton, Bristol, United Kingdom;

    Airbus Operations Ltd., UK, Filton, Bristol, United Kingdom;

    Airbus Operations Ltd., UK, Filton, Bristol, United Kingdom;

    Strain Solutions Ltd., Dunston Innovation Centre, Chesterfield, Derbyshire, United Kingdom;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    digital image correlation; validation;

    机译：数字图像相关;验证;

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