Digital Volume Correlation (DVC) requires a random pattern within the bulk of the specimen. That random pattern is seen as changes in local contrast. In the case of X-ray CT scans the pattern will be produced by changes in material density such as air voids in concrete, or particles of different material type within the main body matrix, such as tin particles distributed in an aluminum powder The volume image is sub divided into interrogation sub-volumes within which the displacement of the pattern is computed.
DVC is a powerful non-intrusive technique for the identification of sub-surface material deformation and is capable of identifying defects, discontinuities or other material characteristics.
In order for Digital Volume Correlation to be successful the volume images must contain a random pattern. That random pattern is seen as changes in local contrast. In the case of X-ray CT scans the pattern will be produced by changes in material density such as air voids in concrete, or particles of different material type within the main body matrix, such as Digital Volume Correlation (DVC) tin particles distributed in an aluminium powder. The volume image is sub-divided into interrogation volumes within which robust and highly accurate algorithms calculate the displacement of the pattern, which represent the material shift. Digital Volume Correlation is capable of yielding over one million displacement vectors per volume image pair.
Continue Reading
Laser Doppler Velocimetry (LDV)
Laser Doppler Velocimetry (LDV) is a technique which allows the measurement
Rayleigh scattering
Rayleigh scattering is the elastic scattering of light by particles much smaller
Interferometric Mie Imaging
IMI imaging of single droplets Interferometric Mie Imaging (IMI) is a
Mie scattering
Mie scattering is elastic scattered light of particles that have a