Nondestructive Computed Tomography Volumetric Void Acceptance Criteria for Heavy Polymer Sections
Computed tomography volumetric void acceptance requires zoning heavy polymer walls by stress field, setting pore limits below 0.1% in tensile skins.
VDI VDE 2630
Meaning
Technical guideline standards published by German engineering associations define comprehensive accuracy testing and calibration protocols for industrial computed tomography dimensional metrology systems. Adherence to vdi vde 2630 provides traceably calibrated workflows for measuring internal and external polymer part dimensions using CT scan volume datasets. The document governs sphere-distance error calculations, probing size unsharpness, structural resolution limits, and length measurement uncertainty evaluations.
Its scope stops at CT dimensional metrology calibration, excluding surface rough inspection, chemical analysis, and planar X-ray radiography.
Metrological Guideline
Dimensional metrology frameworks defined within European engineering guidelines establish traceable calibration procedures for industrial CT scanner performance. Following vdi vde 2630 ensures that dimensional measurements taken from voxel data sets possess documented measurement uncertainty values.
Calibration Boundary
Industrial CT scanners measure geometric features indirectly from reconstructed voxel intensity grids, making dimensional readings sensitive to temperature drift, focal spot wobble, and rotation axis tilt. Applying vdi vde 2630 requires scanning certified reference artifacts, such as ruby sphere trees or calibrated step gauges, to quantify length measurement errors across the scan volume. Dimensional tolerances declared on engineering drawings cannot be verified legally without establishing measurement uncertainty through these standard calibration protocols.
Thermal variations in the scan chamber must be controlled tightly to prevent thermal expansion of plastic test parts during long calibration scans.
Uncertainty Estimation
Uncalibrated computed tomography systems introduce unquantified measurement errors that compromise tool approval signoffs. Applying vdi vde 2630 testing standards validates coordinate measuring performance and guarantees traceable accuracy across critical polymer inspections.