A novel method to investigate cement-casing bonding using digital image correlation

Video deflectometer based on using off-axis digital image correlation (DIC) has emerged as a robust non-contact optical tool for deflection measurements of bridges. In practice, a video deflectometer often needs to measure the deflections at multiple positions of the bridge. The existing 2D-DIC-based measurement methods usually use a laser rangefinder to measure the distance from each point to the camera to obtain the scale factor for the point. It is only suitable for the deflection measurements of a few points since manually measuring distances for a large number of points is time consuming and impractical. In this paper, a novel method for full-field bridge deflection measurement based on off-axis DIC is proposed. Because the bridge is usually a slender structure and the region of interest on the bridge is often a narrow band, the new approach can determine the scale factors of all the points of interest with a spatial straight-line fitting scheme. Moreover, the proposed technique employs reliability-guided processing and a fast initial parameter estimation strategy for real-time and accurate image-matching analysis. An indoor cantilever beam experiment verified the accuracy of the proposed approach, and a field test of a high-speed railway bridge demonstrated the robustness and practicability of the technique.

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A Novel Method of Vein Detection with the Use of Digital Image Correlation

Entropy ◽

10.3390/e23040401 ◽

2021 ◽

Vol 23 (4) ◽

pp. 401

Author(s):

Zbigniew Lutowski ◽

Sławomir Bujnowski ◽

Beata Marciniak ◽

Sylwester Kloska ◽

Anna Marciniak ◽

...

Keyword(s):

Digital Image Correlation ◽

Adverse Events ◽

Mobile Phone ◽

Digital Image ◽

Image Correlation ◽

Blood Collection ◽

Novel Technique ◽

Specialized Equipment ◽

Novel Method ◽

Mobile Phone Camera

Digital image correlation may be useful in many different fields of science, one of which is medicine. In this paper, the authors present the results of research aimed at detecting skin micro-shifts caused by pulsation of the veins. A novel technique using digital image correlation (DIC) and filtering the resulting shifts map to detect pulsating veins was proposed. After applying the proposed method, the veins in the forearm were visualized. The proposed technique may be used in the diagnosis of venous stenosis and may also contribute to reducing the number of adverse events during blood collection. The great advantage of the proposed method is the lack of the need to have specialized equipment, only a typical mobile phone camera is needed to perform the test.

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A novel method to measure skin mechanical properties with three-dimensional digital image correlation

Skin Research and Technology ◽

10.1111/srt.12596 ◽

2018 ◽

Vol 25 (1) ◽

pp. 60-67 ◽

Cited By ~ 1

Author(s):

Z. Xu ◽

J. Dela Cruz ◽

C. Fthenakis ◽

C. Saliou

Keyword(s):

Mechanical Properties ◽

Digital Image Correlation ◽

Digital Image ◽

Three Dimensional ◽

Image Correlation ◽

Novel Method

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Inverse Interval Field Quantification via Digital Image Correlation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.885.304 ◽

2018 ◽

Vol 885 ◽

pp. 304-310

Author(s):

Matthias Faes ◽

David Moens

Keyword(s):

Digital Image Correlation ◽

Digital Image ◽

Spatial Uncertainty ◽

Image Correlation ◽

The Novel ◽

Full Field ◽

Novel Method ◽

Interval Valued ◽

Accurate Quantification

This paper presents the application of a new method for the identification and quantification of interval valued spatial uncertainty under scarce data.Specifically, full-field strain measurements, obtained via Digital Image Correlation, are applied in conjunction with a quasi-static finite element model.To apply these high-dimensional but scarce data, extensions to the novel method are introduced.A case study, investigating spatial uncertainty in Young's modulus of PA-12 parts, produced via Laser Sintering, shows that an accurate quantification of the constituting uncertainty is possible, albeit being somewhat conservative with respect to deterministic values reported in literature.

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