Deep Defect Detection within Thick Multilayer Aircraft Structures Containing Steel Fasteners Using a Giant-Magneto Resistive (GMR) Sensor (Preprint)
Abstract
Defect detection within thick multilayer structures containing steel fasteners is a challenging task in eddy current testing due to the magnetic permeability of the fasteners and overall thickness of the structure. To address these issues, a magnet is applied to the fasteners during the inspection to reduce the noise caused by the permeability. Using a GMR sensor coupled with a lock-in amplifier to increase eddy current sensitivity, data is obtained and at low frequencies. After developing a basic signal processing algorithm, the experimental results show this system can detect second layer defects occurring 10-mm below the surface of an aluminum structure with steel fasteners.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 2007
- Accession Number
- ADA476897
Entities
People
- Gary J. Steffes
- Ray T. Ko
Organizations
- University of Dayton