Spatial Mapping
Scalar sensor arrays detect minute variances in electromagnetic flux to reconstruct current distribution across planar surfaces. Magnetic field imaging provides a non-destructive method to locate short circuits, open traces, or resistive vias buried within multilayer substrates. High-resolution probes map the vector magnitude of fields generated by excitation currents flowing through a populated circuit board.
This diagnostic capability permits the isolation of hidden defects that remain invisible to traditional visual or automated optical inspection systems.
Defect Resolution
Precise localization of board failures relies on the mathematical inversion of measured magnetic data to determine the spatial origin of an anomaly. Variations in local current density indicate path interruptions or unexpected parasitic connections which occur during lamination or thermal cycling. Data sets generated during the scanning process allow engineers to distinguish between benign trace asymmetries and structural faults that degrade signal integrity.
Software algorithms convert raw signal gradients into visual heat maps representing the path of electron flow through copper geometries. Effective detection requires a baseline scan of a known good unit to provide a standard against which production boards compare.
Inspection Utility
Surface current characterization serves as a gate for identifying latent workmanship errors after reflow or press-fit assembly. Manufacturers employ this technique when electrical testing shows anomalous impedance without clear evidence of open circuits on external layers. Probe sensitivity defines the depth at which internal short circuits are detectable by the hardware.
Small sensing coils capture the magnetic signature of the board while automated gantry systems move the sensor across the entire active area. Signal processing cleans the captured field data to eliminate environmental noise from factory floor machinery. Automated magnetic inspection offers a reliable path to locating buried faults that impede performance in high-density interconnect designs.
