1 May 2007 Principles and research of a high accuracy digital image correlation measurement system
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Optical Engineering, 46(5), 051006 (2007). doi:10.1117/1.2741215
Abstract
We present a new, high-accuracy digital image correlation measurement system based on a double long-focus CCD microscope. This has many advantages, such as noncontact measurement, high accuracy, quasi real time, and convenient operation. It can be used in the measurement of strain (especially in strain measurement of flexible high-molecular synthetic material, where the strain measured is averaged data) and linear expansibility of new material that has low expansibility. It can measure strain that is less than 1 με when it is used in strain measurement. The conventional digital image correlation technology can measure strain that should be more than 20 με. An array optical element is used to set the mark of 0.05 mm. The time-average method is used to eliminate CCD noise and bad effects caused by liberation, so the correlation measurement sensitivity is up to 0.01 pixel. The result of the strain test for metal material is listed. Moreover, we illustrate that the digital image correlation measurement method is the technology of a high-point diffraction resolving ratio in a super optics system.
Guobiao Yang, Kui Wu, "Principles and research of a high accuracy digital image correlation measurement system," Optical Engineering 46(5), 051006 (1 May 2007). http://dx.doi.org/10.1117/1.2741215
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KEYWORDS
Digital image correlation

Digital imaging

Charge-coupled devices

Distortion

Optical engineering

Microscopes

Optical components

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