Research to Develop and Evaluate Advanced Eddy Current Sensors for Detecting Small Flaws in Metallic Aerospace Components.
Abstract
The purpose of this program was to develop a reproducible, highly sensitive novel eddy current probe applying the technique of ferromagnetic resonance (FMR). The method developed must be suited to inspect test objects where access may be limited, for example bolt holes of turbine engine disks. This program studied the FMR probe in both its passive and active modes. An active probe was developed and tested that demonstrated that the FMR technique is a practical approach for inspection of metallic aerospace components. The program consisted of three tasks. In Task I the theoretical analysis and modeling was performed by Stanford Universtiy under subcontract with Battelle. This analysis and modelling served as a guide in probe design concepts for Battelle's experimental evaluation, which was performed in Task II. Finally, a demonstration, comprising Task III, was performed for Air Force Materials Laboratory personnel at Battelle's facility in which five FMR probes of the same design were tested. The results of the demonstration confirmed the FMR probe design's reproducibility and repeatable high sensitivity for detecting flaws located in a titanium bolt-hole specimen. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1982
- Accession Number
- ADA125873
Entities
People
- Bert A. Auld
- James M. Prince