Modified two-dimensional digital image correlation method with capability of merging of data distributed in time

Abstract

In this article an analysis of two-dimensional (2D) digital image correlation (DIC) data captured over a long period of time is presented, where the case of a 2D DIC setup is not fixed in the same position between consecutive measurements. An implementation of the data merging procedure is described and a proof of concept is provided using example measurements for both: a numerical model and a physical model. An evaluation of the accuracy of the method and main sources of errors are also presented. The developed method can be used for long-term monitoring of different kinds of objects, which is particularly important for the use of DIC technique in application, e.g., building engineering, building control, or power engineering.

Application of Digital Image Correlation and Geodetic Displacement Measuring Methods to Monitor Water Dam Behavior under Dynamic Load

“…Actions in this direction have the greatest influence onto statics and safety of the object. 2D DIC method allows to visualize deformations only in the 2D space, in plane parallel to the external surface of the structure, however, the method can be extended into 3D by use of two synchronized cameras set in a stereo setup [7].…”

Digital Speckle Photography with Correlation Processing of Spatial Spectrum of Specklegram for Determination of Micro Displacement of Scattering Object

“…Прямое определение смещения спекл-структуры реализуется корреляционным спосо-бом [9,10], но этот метод не даёт субпиксельной точности измерений и не действует в диапазоне субпиксельной величины смещений.…”

“…Непосредственное определение вектора по-перечного смещения спекл-структуры возможно методом взаимной корреляции смещенной и несмещенной спекл-структур [9][10][11]. Использо-вание корреляционного метода для определения взаимного смещения спекл-структур имеет много преимуществ, таких как простота реализации, возможность автоматизации процессов измере-ния, прямое получение информации о смещении спекл-структуры без преобразования в частотную область.…”

Validation of Aramis Digital Image Correlation System for Tests of Fibre Concrete Based on Waste Aggregate

“…The second objective was to test cast elements using two methods: traditional limit of proportionality (LOP) method described in EN 14651 and a method based on optical measurements with the help of Digital Image Correlation (DIC) System. DIC is a validated and well-established method for determining displacements in the domain of experimental mechanics and vision-based optical metrology (Melasa & Kujawska 2012, Melasa & Kujawska 2013. It is being increasingly used to monitor civil engineering structures (Piekarczuk et al 2012).…”