Journal ArticleDOI
Soil deformation measurement using particle image velocimetry (PIV) and photogrammetry
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A deformation measurement system based on particle image velocimetry (PIV) and close-range photogrammetry has been developed for use in geotechnical testing as mentioned in this paper.Abstract:
A deformation measurement system based on particle image velocimetry (PIV) and close-range photogrammetry has been developed for use in geotechnical testing. In this paper, the theory underlying this system is described, and the performance is validated. Digital photography is used to capture images of planar soil deformation. Using PIV, the movement of a fine mesh of soil patches is measured to a high precision. Since PIV operates on the image texture, intrusive target markers need not be installed in the observed soil. The resulting displacement vectors are converted from image space to object space using a photogrammetric transformation. A series of validation experiments are reported. These demonstrate that the precision, accuracy and resolution of the system are an order of magnitude higher than previous image-based deformation methods, and are comparable to local instrumentation used in element testing. This performance is achieved concurrent with an order of magnitude increase in the number of meas...read more
Citations
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Journal ArticleDOI
Camera Calibration Using Neural Network for Image-Based Soil Deformation Measurement Systems
Honghua Zhao,Louis Ge +1 more
TL;DR: A neural network camera calibration algorithm has been adapted for image-based soil deformation measurement systems that provides a highly accurate prediction of object data points from their corresponding image points.
Book ChapterDOI
The Use of Digital Speckle Radiography to Investigate the Internal Flow Fields During the Ballistic Penetration of Sand
TL;DR: In this paper, the internal flow fields in dry sand ballistically impacted by rods of different nose shapes were quantified using digital speckle radiography, the X-ray version of digital image correlation.
Journal ArticleDOI
High-resolution flying-PIV with optical fiber laser delivery
Noah A. Weichselbaum,Matthieu A. Andre,Morteza Rahimi-Abkenar,Majid T. Manzari,Philippe M. Bardet +4 more
TL;DR: In this article, a particle image velocimetry (PIV) camera is directly mounted on a moving shake table with care to minimize its vibrations, and a special arrangement of PIV planes is deployed for precise in-situ PIV alignment and to account for residual structure vibrations and beam wandering.
Journal ArticleDOI
Local strain mapping of GO nanosheets under in situ TEM tensile testing
TL;DR: In this article, a technique that achieves local strain mapping of 2D materials at nanoscale through gold nanoparticle decoration over GO under in situ TEM tensile testing and imaging is presented.
References
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Journal ArticleDOI
Particle-Imaging Techniques for Experimental Fluid Mechanics
TL;DR: A review of these methods can be found in articles by Lauterborn & Vogel (1984), Adrian (1986a), Hesselink (1988), and Dudderar et al..
Proceedings ArticleDOI
A four-step camera calibration procedure with implicit image correction
Janne Heikkilä,Olli Silven +1 more
TL;DR: This paper presents a four-step calibration procedure that is an extension to the two-step method, and a linear method for solving the parameters of the inverse model is presented.
Proceedings ArticleDOI
Calibration procedure for short focal length off-the-shelf CCD cameras
Janne Heikkilä,Olli Silven +1 more
TL;DR: A camera calibration procedure intended for a 3D measurement application is presented, paying attention to the various error sources, and notices that a more complete camera model is needed to explain all the error components.
Journal ArticleDOI
A review of instrumentation for measuring small strains during triaxial testing of soil specimens
TL;DR: In this article, the authors present a survey of small-strain measuring devices and their modes of operation, benefits, capabilities, and limitations, as well as a classification of internal and external measuring devices.