Standard Guide
A standardized document establishes the general principles and guidelines for performing computed tomography to evaluate the internal structure of industrial components. Adopted across the electronics manufacturing sector, astm e1441 governs the non-destructive testing of internal geometries by specifying parameters for digital reconstructions. The guideline focuses on standardizing the terminology, scan configurations and processing algorithms used during volumetric inspection.
It does not dictate pass or fail criteria for specific components, leaving those limits to individual engineering drawings or master specifications. Manufacturers utilize the document to calibrate industrial computerized tomography systems and ensure that density-based volumetric datasets remain consistent across different inspection laboratories.
Examination Method
High-resolution scans capture density variations across internal solder interfaces and microvia connections without damaging the circuit board. System operators adjust x-ray tube voltage and exposure times according to the thickness and density of the target board material. Multiple projection angles provide the raw attenuation data for mathematical algorithms to reconstruct cross-sectional slices.
These digital slices show voids, cracks and delamination within buried layers.
Inspection Limitation
Dense materials like copper planes and lead solder attenuate the x-ray signal, creating streak artifacts that obscure nearby features. Processing times for sub-micron scans restrict the method to engineering audits rather than high-throughput production lines.
