Basic Micro CT System Calibration Protocols for Industrial Polymer Inspection
Rigorous geometric alignment, beam pre-filtration, and traceable phantom calibration ensure sub-voxel dimensional accuracy in industrial polymer CT inspection.
Center of Rotation Calibration
Meaning
Calibration procedures that determine the exact physical axis around which an object rotates relative to the imaging sensor ensure the spatial integrity of reconstructed three-dimensional volumes. Executing a center of rotation calibration ensures that the rotational axis corresponds precisely to the center of the reconstruction grid. Without this adjustment, reconstructed slice images suffer from tuning-fork or double-edge artifacts that degrade spatial resolution.
Geometric Accuracy
Regular execution of this routine compensates for minor thermal shifts or mechanical wear in the rotating stage.
Scan Execution
Acquiring X-ray projections of a reference sphere or cylinder at opposing angles allows the software to calculate any offset in the center of rotation. This computed offset is then applied to the backprojection algorithm during image reconstruction. In high-precision manufacturing, performing this run prior to starting a production batch is necessary to ensure dimensional accuracy.
Automated systems can run this procedure in less than two minutes, making it a cost-effective preventive measure against large-scale scrap.
Spatial Error
Ignoring the calibration leads to blurred edges and incorrect feature measurements on finished parts. If center of rotation calibration is deferred to maximize system uptime, the resulting dataset may fail dimensional audits, requiring expensive rescans. This bottleneck can be avoided by scheduling short, automated runs at the start of each shift.