Computed Tomography X-ray Inspections
Microtomography uses x-rays to create cross-sections of a 3D-object that later can be used to recreate a virtual model without destroying the original model.
Computed Tomography X-ray inspection is a nondestructive and noncontact method of obtaining internal and external information of almost any object ranging from few microns to feet in size. X-Ray’s pass through most materials, and form an image in transparency, thereby revealing the internal structure of objects.
This technique sees its applications where internal defect detection and characterization is very critical like meterology, failure analysis, weld quality analysis, assembly analysis and reverse engineering. The X-ray source and detector are typically stationary during the scan while the sample rotates.
Volume rendering is a technique used to display a 2D projection of a 3D discretely sampled data set, as produced by a microtomography scanner. Usually these are acquired in a regular pattern (e.g., one slice every millimeter or so) and usually have a regular number of image pixels in a regular pattern. This is an example of a regular volumetric grid, with each volume element, or voxel represented by a single value that is obtained by sampling the immediate area surrounding the voxel.
Once the data file is generated containing the 3-D reconstruction, the volume can be viewed using VGStudio Max 2.0 software. This package is a 3-D visualization software heavily used for industrial computer-tomography data analysis.
The CT scans are performed offsite and the post processing of the CT images is performed onsite at DTB. Currently we use this technique in several defect inspections with a recent application to characterize internal defects in helicopter rotor blades root section.