New Optical Scanning Tomography using a rotating slicing for time-resolved measurements of 3D full field displacements in structures

• Published in: Optics and lasers in engineering 2014-07, Vol.58, p.85-92
• Main Authors: Morandi, P., Brémand, F., Doumalin, P., Germaneau, A., Dupré, J.C.
• Format: Article
• Language: English
• Subjects: Digital Volume Correlation; Full 3D displacement measurement; Laser beams; Optical data processing; Optical Scanning Tomography; Planes; Rigid-body dynamics; Rotating; Rotating slicing; Scanning; Three dimensional; Time-resolved volume acquisition; Tomography
• ISSN: 0143-8166; 1873-0302
• DOI: 10.1016/j.optlaseng.2014.02.007

In this paper, a new optical tomography process is presented. It has been developed for time-resolved measurement of kinematic fields in the whole volume of structure. This new process is based on the scan of the specimen by a plane laser beam submitted to a motion of rotation. Calibration and reconstruction steps have been established and are described in this document. Acquisition is achieved by illuminating successive slices in the specimen using a rotating plane laser beam and data are recorded with a single CCD camera. The recorded volumes are analyzed by Digital Volume Correlation to measure the three displacement components in the bulk. This new acquisition process is assessed by performing sub-voxel rigid body translations along the three axes. We discuss the quality of a reconstructed volume and also the measurement accuracy in terms of mean error and standard deviation through rigid body displacement tests. Results are compared with those obtained using classical Optical Scanning Tomography (OST) and using X-ray Tomography. •Development of a new optical scanning tomography technique.•Performing of full 3D time-resolved acquisitions.•Performing subvoxel displacement tests.•Assessment of displacement errors with Digital Volume Correlation.