Buried Corrosion Detection in Multi-layer Airframe Structures Using Pulsed Eddy Current

摘要

Substantial enhancements in Pulsed Eddy Current instrumentation and array probes provide a unique capability for the detection and imaging of sub-layer corrosion. The use of giant magnetoresistive (GMR) elements in an inductive array provides increased depth of sensitivity over conventional eddy-current sensing coils. This paper provides an overview of newly developed instrumentation, which provides a portable, battery-operated platform for multi-layer corrosion detection in flight line or repair facilities. Demonstrated capability includes rapid inspection and detection of material loss in lap joints with air gaps and complex geometries. Advanced imaging capability and post-processing allows multi-layer analysis, with distinct C-scan images of up to four (4) 1-mm layers.